Abstract:
The present invention relates to novel pyrimidine derivatives and their use in perfume compositions. The novel pyrimidine derivatives of the present invention are represented by the following formula: 
     
       
                 
         
             
             
         
       
       
         
           
             wherein m and n are integers that when m is 0, n is 1; when m is 1, n is 0 or 1; or when m is 2, n is 0; 
             wherein (CH) m  and (CH) n  are each independently optionally substituted with a substituent selected from the group consisting of methyl and ethyl; 
             wherein X is selected from the group consisting of N, O, and S; and 
             wherein R 1  and R 2  each independently represent H or a hydrocarbon group, or R 1  and R 2  together represent a fused ring or a ring system, 
             with the proviso that when R 1  is H, R 2  is not H.

Description:
STATUS OF RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. Ser. No. 13/430,908, filed Mar. 27, 2012, now pending, which is a continuation-in-part of U.S. Ser. No. 13/027,314, filed Feb. 15, 2011, now pending, the contents hereby incorporated by reference as if set forth in its entirety. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to new chemical entities and the incorporation and use of the new chemical entities as fragrance materials. 
     BACKGROUND OF THE INVENTION 
     There is an ongoing need in the fragrance industry to provide new chemicals to give perfumers and other persons the ability to create new fragrances for perfumes, colognes and personal care products. Those with skill in the art appreciate how differences in the chemical structure of the molecule can result in significant differences in the odor, notes and characteristics of a molecule. These variations and the ongoing need to discover and use the new chemicals in the development of new fragrances allow the perfumers to apply the new compounds in creating new fragrances. 
     SUMMARY OF THE INVENTION 
     The present invention provides novel compounds and their unexpected advantageous use in enhancing, improving or modifying the fragrance of perfumes, colognes, toilet water, fabric care products, personal products and the like. 
     More specifically, the present invention relates to novel pyrimidine derivatives represented by Formula I set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein m and n are integers that when m is 0, n is 1; when m is 1, n is 0 or 1; or when m is 2, n is 0; 
     wherein (CH) m  and (CH) n  are each independently optionally substituted with a substituent selected from the group consisting of methyl and ethyl; 
     wherein X is selected from the group consisting of N, O, and S; and 
     wherein R 1  and R 2  each independently represent H or a hydrocarbon group, or R 1  and R 2  together represent a fused ring or a ring system, 
     with the proviso that when R 1  is H, R 2  is not H. 
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula II set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein a pyrimidine ring 1 is attached to a proximal ring 2, and wherein the proximal ring 2 is attached to a distal ring 3; 
     wherein o is an integer of 0 or 1; 
     wherein R 3  represents a substituent in any position of the distal ring 3 and is selected from the group consisting of H, methyl, and ethyl; 
     wherein R 4  represents a substituent in any position of the proximal ring 2 and is H or methyl; and 
     wherein the broken line represents a single or double bond, 
     with the proviso that when R 3  is H, R 4  is not H. 
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula III set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein R 5  and R 6  each independently represent H or a C 1 -C 6  straight or branched, saturated or unsaturated hydrocarbon group; and 
     wherein the broken line represents a single or double bond, 
     with the proviso that R 5  and R 6  together contain 3-10 carbon atoms. 
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula IV set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein R 7  and R 8  each independently represent H or a C 1 -C 8  straight or branched, saturated or unsaturated hydrocarbon group, 
     with the proviso that R 7  and R 8  together contain 4-8 carbon atoms. 
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula V set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein p is an integer selected from the group consisting of 0, 1, and 2; and 
     wherein R 9  represents a 5 to 6 membered saturated or unsaturated hydrocarbon ring substituted with a substituent selected from the group consisting of methyl and ethyl. 
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula VI set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein R 10  represents 
     
       
                 
         
             
             
         
      
     
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula VII set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein a pyrimidine ring 4 is attached to a proximal ring 5, and wherein the proximal ring 5 is attached to a distal ring 6; 
     wherein R 9  represents a substituent in any position of the proximal ring 5 and is selected from the group consisting of H, methyl, and ethyl; 
     wherein R 10  represents a substituent in any position of the distal ring 6 and is selected from the group consisting of H, methyl, and ethyl; and 
     wherein the broken line represents a single or double bond, 
     with the proviso that R 9  and R 10  together contain at least two carbon atoms. 
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula VIII set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein R 11  and R 12  taken together represent 
     
       
                 
         
             
             
         
      
     
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula IX set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein a ring 7 is attached to a proximal ring 8, and wherein the proximal ring 8 is attached to a distal ring 9; 
     wherein q and r are each independently integers of 0 or 1 that when q is 0, r is 1; or when q is 1, r is 0 or 1; 
     wherein s represents an integer of 0 or 1; 
     wherein Y represents O or S; 
     wherein R 13  represents a substituent in any position of the distal ring 9 and is selected from the group consisting of H, methyl, and ethyl; 
     wherein R 14  represents a substituent in any position of the proximal ring 8 and is H or methyl; and 
     wherein the broken line represents a single or double bond, 
     with the proviso that when R 13  is H, R 14  is not H. 
     Another embodiment of the present invention relates to a subgenus of pyrimidine derivatives represented by Formula X set forth below: 
     
       
                 
         
             
             
         
      
     
     wherein a pyrazine ring 10 is attached to a proximal ring 11, and wherein the proximal ring 11 is attached to a distal ring 12; 
     wherein t represents an integer of 0 or 1; 
     wherein R 15  represents a substituent in any position of the distal ring 12 and is selected from the group consisting of H, methyl, and ethyl; 
     wherein R 16  represents a substituent in any position of the proximal ring 11 and is H or methyl; and 
     wherein the broken line represents a single or double bond, 
     with the proviso that when R 15  is H, R 16  is not H. 
     Another embodiment of the present invention relates to a fragrance composition comprising the novel compounds provided above. 
     Another embodiment of the present invention relates to a fragrance product comprising the compounds provided above. 
     Another embodiment of the present invention relates to a method of improving, enhancing or modifying a fragrance formulation through the addition of an olfactory acceptable amount of the novel compounds provided above. 
     These and other embodiments of the present invention will be apparent by reading the following specification. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The novel pyrimidine derivatives represented by Formula I of the present invention are illustrated, for example, by following examples.
     1,1,2,3,3-Pentamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene:   

     
       
                 
         
             
             
         
      
         
         1,1,2,3,3-Pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene: 
       
    
     
       
                 
         
             
             
         
      
         
         1,1,3,3-Tetramethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene: 
       
    
     
       
                 
         
             
             
         
      
         
         1,1,3,3-Tetramethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene: 
       
    
     
       
                 
         
             
             
         
      
         
         1,1,2,3,3,5-Hexamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene: 
       
    
     
       
                 
         
             
             
         
      
         
         1,1,2,3,3,5-Hexamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene: 
       
    
     
       
                 
         
             
             
         
      
         
         7,7,10,10-Tetramethyl-5,6,7,8,9,10-hexahydro-benzo[h]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         7,7,10,10-Tetramethyl-5,6,6a,7,8,9,10,10a-octahydro-benzo[h]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         5,7,7,8,10,10-Hexamethyl-5,6,7,8,9,10-hexahydro-benzo[h]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         5,7,7,8,10,10-Hexamethyl-5,6,6a,7,8,9,10,10a-octahydro-benzo[h]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         7,7,10a-Trimethyl-5,6,6a,7,8,9,10,10a-octahydro-benzo[h]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         8-Isopropyl-5,6,7,8-tetrahydro-quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         8-tert-Butyl-5,6,7,8-tetrahydro-quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         5-(1,5-Dimethyl-hex-4-enyl)-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4-tert-Butyl-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4-(2,2-Dimethyl-propyl)-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4,5-Diisopropyl-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4,5-Di-tert-butyl-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         5-tert-Butyl-4-(2,2-dimethyl-propyl)-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4-(2,6,6-Trimethyl-cyclohex-3-enyl)-pyrimidine 
       
    
     
       
                 
         
             
             
         
      
         
         4-(3,3-Dimethyl-cyclohexyl)-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4-[2-(2,6,6-Trimethyl-cyclohex-1-enyl)-ethyl]-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4-[2-(2,5,6,6-Tetramethyl-cyclohex-1-enyl)-ethyl]-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4-(1,1,2,3,3-Pentamethyl-indan-5-yl)-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         4-(6-tert-Butyl-1,1-dimethyl-indan-4-yl)-pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         6,6,9a-Trimethyl-5,5a,6,7,8,9,9a,10-octahydro-benzo[g]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         5a,10-Dimethyl-5,5a,6,7,8,9-hexahydro-benzo[g]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         5a,10-Dimethyl-5,5a,6,7,8,9,9a,10-octahydro-benzo[g]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         6,6,10,10-Tetramethyl-5,7,8,9,10,10a-hexahydro-6H-6a,9-methanobenzo[H]quinazoline: 
       
    
     
       
                 
         
             
             
         
      
         
         5,7,7,10-Tetramethyl-6,7,7a,8,9,10-hexahydro-5H-6,10a-methanoazuleno[5,4-d]pyrimidine: 
       
    
     
       
                 
         
             
             
         
      
         
         5,6,7,8-Tetrahydro-6,6,7,8,8-pentamethyl-4H-indeno[5,4-D]isoxazole: 
       
    
     
       
                 
         
             
             
         
      
         
         5,5a,6,7,8,8a-hexahydro-6,6,7,8,8-pentamethyl-4H-indeno[5,4-D]isoxazole: 
       
    
     
       
                 
         
             
             
         
      
         
         6,6,7,8,8-Pentamethyl-5,6,7,8-tetrahydro-4H-1-oxa-3-aza-as-indacene: 
       
    
     
       
                 
         
             
             
         
      
         
         6,6,7,8,8-Pentamethyl-5,6,7,8-tetrahydro-4H-indeno[4,5-d]oxazole: 
       
    
     
       
                 
         
             
             
         
      
         
         6,6,7,8,8-Pentamethyl-5,5a,6,7,8,8a-hexahydro-4H-1-oxa-3-aza-as-indace: 
       
    
     
       
                 
         
             
             
         
      
         
         6,6,7,8,8-Pentamethyl-5,5a,6,7,8,8a-hexahydro-4H-indeno[4,5-d]oxazole: 
       
    
     
       
                 
         
             
             
         
      
         
         2,6,6,7,8,8-Hexamethyl-5,6,7,8-tetrahydro-4H-3-thia-1-aza-as-indacene: 
       
    
     
       
                 
         
             
             
         
      
         
         2,6,6,7,8,8-Hexamethyl-5,5a,6,7,8,8a-hexahydro-4H-3-thia-1-aza-as-indacene: 
       
    
     
       
                 
         
             
             
         
      
         
         7,7,8,9,9-Pentamethyl-5,7,8,9-tetrahydro-6H-cyclopenta[f]quinoxaline: 
       
    
     
       
                 
         
             
             
         
      
         
         7,7,8,9,9-Pentamethyl-5,6a,7,8,9,9a-hexahydro-6H-cyclopenta[f]quinoxaline: 
       
    
     
       
                 
         
             
             
         
      
     
     Those with skill in the art will recognize that the compounds of the present invention contain chiral centers, thereby providing a number of isomers of the claimed compounds. For example, the compounds of Structure 1 and Structure 2 described in the above contain chiral centers indicated with asterisks (*) in the following: 
     
       
                 
         
             
             
         
      
     
     Thus, the isomeric forms of Structure 1 and Structure 2 may be further represented, respectively, by the following structures: 
     
       
                 
         
             
             
         
      
     
     Structure 1a represents 2S-1,1,2,3,3-pentamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene; 
     Structure 1b represents 2R-1,1,2,3,3-pentamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene; 
     Structure 2a represents diastereomeric mixture cis-1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1 H-7,9-diaza-cyclopenta[a]naphthalene; and 
     Structure 2b represents diastereomeric mixture trans-1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene. 
     It is intended herein that the compounds described herein include isomeric mixtures of such compounds, as well as those isomers that may be separated using techniques known to those having skill in the art. Suitable techniques include chromatography such as high performance liquid chromatography, referred to as HPLC, and particularly silica gel chromatography and gas chromatography trapping known as GC trapping. Yet, commercial products are mostly offered as isomeric mixtures. 
     The preparation of the compounds of the present invention is detailed in the Examples. Materials were purchased from Aldrich Chemical Company unless noted otherwise. 
     The use of the compounds of the present invention is widely applicable in current perfumery products, including the preparation of perfumes and colognes, the perfuming of personal care products such as soaps, shower gels, and hair care products, fabric care products, air fresheners, and cosmetic preparations. The present invention can also be used to perfume cleaning agents, such as, but not limited to detergents, dishwashing materials, scrubbing compositions, window cleaners and the like. 
     In these preparations, the compounds of the present invention can be used alone or in combination with other perfuming compositions, solvents, adjuvants and the like. The nature and variety of the other ingredients that can also be employed are known to those with skill in the art. Many types of fragrances can be employed in the present invention, the only limitation being the compatibility with the other components being employed. Suitable fragrances include but are not limited to fruits such as almond, apple, cherry, grape, pear, pineapple, orange, strawberry, raspberry; musk, flower scents such as lavender-like, rose-like, iris-like, carnation-like. Other pleasant scents include herbal and woodland scents derived from pine, spruce and other forest smells. Fragrances may also be derived from various oils, such as essential oils, or from plant materials such as peppermint, spearmint and the like. 
     A list of suitable fragrances is provided in U.S. Pat. No. 4,534,891, the contents of which are incorporated by reference as if set forth in its entirety. Another source of suitable fragrances is found in  Perfumes, Cosmetics and Soaps , Second Edition, edited by W. A. Poucher, 1959. Among the fragrances provided in this treatise are acacia, cassie, chypre, cyclamen, fern, gardenia, hawthorn, heliotrope, honeysuckle, hyacinth, jasmine, lilac, lily, magnolia, mimosa, narcissus, freshly-cut hay, orange blossom, orchid, reseda, sweet pea, trefle, tuberose, vanilla, violet, wallflower, and the like. 
     The compounds of the present invention can be used in combination with a complementary fragrance compound. The term “complementary fragrance compound” as used herein is defined as a fragrance compound selected from the group consisting of 2[(4-methylphenyl)methylene]-heptanal (Acalea), iso-amyl oxyacetic acid allylester (Allyl Amyl Glycolate), (3,3-dimethylcyclohexyl)ethyl ethyl propane-1,3-dioate (Applelide), (E/Z)-1-ethoxy-1-decene (Arctical), 2-ethyl-4-(2,2,3-trimethyl-3-cyclo-penten-1-yl)-2-buten-1-ol (Bacdanol), 2-methyl-3-[(1,7,7-trimethylbicyclo[2.2.1]hept-2-yl)oxy]exo-1-propanol (Bornafix), 1,2,3,5,6,7-hexahydro-1,1,2,3,3-pentamethyl-4H-inden-4-one (Cashmeran), trimethylcyclopentenylmethyloxabicyclooctane (Cassiffix), 1,1-dimethoxy-3,7-dimethyl-2,6-octadiene (Citral DMA), 3,7-dimethyl-6-octen-1-ol (Citronellol), 3A,4,5,6,7,7A-hexahydro-4,7-methano-1H-inden-5/6-yl acetate (Cyclacet), 3A,4,5,6,7,7A-hexahydro-4,7-methano-1H-inden-5/6-yl propinoate (Cyclaprop), 3A,4,5,6,7,7A-hexahydro-4,7-methano-1G-inden-5/6-yl butyrate (Cyclobutanate), 1-(2,6,6-trimethyl-3-cyclohexen-1-yl)-2-buten-1-one (Delta Damascone), 3-(4-ethylphenyl)-2,2-dimethyl propanenitrile (Fleuranil), 3-(O/P-ethylphenyl) 2,2-dimethyl propionaldehyde (Floralozone), tetrahydro-4-methyl-2-(2-methylpropyl)-2H-pyran-4-ol (Floriffol), 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta-gamma-2-benzopyran (Galaxolide), 1-(5,5-dimethyl-1-cyclohexen-1-yl)pent-4-en-1-one (Galbascone), E/Z-3,7-dimethyl-2,6-octadien-1-yl acetate (Geranyl Acetate), α-methyl-1,3-benzodioxole-5-propanal (Helional), 1-(2,6,6-trimethyl-2-cyclohexen-1-yl)-1,6-heptadien-3-one (Hexylon), (Z)-3-hexenyl-2-hydroxybenzoate (Hexenyl Salicylate, CIS-3), 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one (Ionone α), 1-(1,2,3,4,5,6,7,8-octahydro-2,3,8,8-tetramethyl-2-naphthalenyl)-ethan-1-one (Iso E Super), methyl 3-oxo-2-pentylcyclopentaneacetate (Kharismal), 2,2,4-trimethyl-4-phenyl-butanenitrile (Khusinil), 3,4,5,6,6-pentamethylhept-3-en-2-one (Koavone), 3/4-(4-hydroxy-4-methyl-pentyl)cyclohexene-1-carboxaldehyde (Lyral), 3-methyl-4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one (Methyl Ionone γ), 1-(2,6,6-trimethyl-2-cyclohexen-1-yl)pent-1-en-3-one (Methyl Ionone α Extra, Methyl Ionone N), 3-methyl-4-phenylbutan-2-ol (Muguesia), cyclopentadec-4-en-1-one (Musk Z4), 3,3,4,5,5-pentamethyl-11,13-dioxatricyclo[7.4.0.0&lt;2,6&gt;]tridec-2(6)-ene (Nebulone), 3,7-dimethyl-2,6-octadien-1-yl acetate (Neryl Acetate), 3,7-dimethyl-1,3,6-octatriene (Ocimene), ortho-tolylethanol (Peomosa), 3-methyl-5-phenylpentanol (Phenoxanol), 1-methyl-4-(4-methyl-3-pentenyl)cyclohex-3-ene-1-carboxaldehyde (Precyclemone B), 4-methyl-8-methylene-2-adamantanol (Prismantol), 2-ethyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol (Sanjinol), 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol (Santaliff), Terpineol, 2,4-dimethyl-3-cyclohexene-1-carboxaldehyde (Triplal), decahydro-2,6,6,7,8,8-hexamethyl-2H-indeno[4,5-B]furan (Trisamber), 2-tert-butylcyclohexyl acetate (Verdox), 4-tert-butylcyclohexyL acetate (Vertenex), acetyl cedrene (Vertofix), 3,6/4,6-dimethylcyclohex-3-ene-1-carboxaldehyde (Vertoliff), and (3Z)-1-[(2-methyl-2-propenyl)oxy]-3-hexene (Vivaldie). 
     The term “hydrocarbon group” means a chemical group that contains only hydrogen and carbon atoms. The hydrocarbon group of the present invention can be a straight, branched and/or cyclic, saturated or unsaturated group. 
     The terms “fragrance formulation”, “fragrance composition”, and “perfume composition” mean the same and refer to a consumer composition that is a mixture of compounds including, for example, alcohols, aldehydes, ketones, esters, ethers, lactones, nitriles, natural oils, synthetic oils, and mercaptans, which are admixed so that the combined odors of the individual components produce a pleasant or desired fragrance. The fragrance formulation of the present invention is a consumer composition comprising a compound of the present invention. The fragrance formulation of the present invention comprises a compound of the present invention and further a complementary fragrance compound as defined above. 
     The term “fragrance product” means a consumer product that adds a fragrance or masks a malodor. Fragrance products may include, for example, perfumes, colognes, personal care products such as soaps, shower gels, and hair care products, fabric products, air fresheners, cosmetic preparations, and perfume cleaning agents such as detergents, dishwashing materials, scrubbing compositions, and window cleaners. The fragrance product of the present invention is a consumer product that contains a compound of the present invention. The fragrance product of the present invention contains a compound of the present invention and further a complementary fragrance compound as defined above. 
     The term “improving” in the phrase “improving, enhancing or modifying a fragrance formulation” is understood to mean raising the fragrance formulation to a more desirable character. The term “enhancing” is understood to mean making the fragrance formulation greater in effectiveness or providing the fragrance formulation with an improved character. The term “modifying” is understood to mean providing the fragrance formulation with a change in character. 
     The term “olfactory acceptable amount” is understood to mean the amount of a compound in a fragrance formulation, wherein the compound will contribute its individual olfactory characteristics. However, the olfactory effect of the fragrance formulation will be the sum of effect of each of the fragrance ingredients. Thus, the compound of the present invention can be used to improve or enhance the aroma characteristics of the fragrance formulation, or by modifying the olfactory reaction contributed by other ingredients in the formulation. The olfactory acceptable amount may vary depending on many factors including other ingredients, their relative amounts and the olfactory effect that is desired. 
     The amount of the compounds of the present invention employed in a fragrance formulation varies from about 0.005 to about 70 weight percent, preferably from 0.005 to about 50 weight percent, more preferably from about 0.5 to about 25 weight percent, and even more preferably from about 1 to about 10 weight percent. Those with skill in the art will be able to employ the desired amount to provide desired fragrance effect and intensity. In addition to the compounds of the present invention, other materials can also be used in conjunction with the fragrance formulation. Well known materials such as surfactants, emulsifiers, polymers to encapsulate the fragrance can also be employed without departing from the scope of the present invention. 
     When used in a fragrance formulation these ingredients provide additional notes to make a fragrance formulation more desirable and noticeable, and add the perception of value. The odor qualities found in these materials assist in beautifying and enhancing the finished accord as well as improving the performance of the other materials in the fragrance. 
     The following are provided as specific embodiments of the present invention. Other modifications of this invention will be readily apparent to those skilled in the art. Such modifications are understood to be within the scope of this invention. As used herein all percentages are weight percent unless otherwise noted, ppm is understood to stand for parts per million, L is understood to be liter, mL is understood to be milliliter, Kg is understood to be kilogram, g is understood to be gram, mol is understood to be mole, psi is understood to be pound-force per square inch, and mmHg be millimeters (mm) of mercury (Hg). IFF as used in the examples is understood to mean International Flavors &amp; Fragrances Inc., New York, N.Y., USA. 
     EXAMPLE I 
     
       
                 
         
             
             
         
      
     
     Preparation of 1,1,3,3-Pentamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 1): A 5 L reaction vessel was charged with Cashmeran™ (412 g, 2.0 mol, commercially available at IFF), formamidine acetate (HN 2 CH═NH/HOOCCH 3 ) (1.03 Kg, 10.0 mol), and butanol (1.2 L). The reaction mixture was heated to 118° C. for 4 hours and then cooled to 25° C. The reaction mixture was washed twice with brine (1 L) and purified by vacuum distillation to afford 1,1,2,3,3-pentamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (260 g) having a boiling point of 140° C. at a pressure of 1.6 mmHg. Further recrystallization from ethanol afforded a solid with a melting point of 80.0° C. 
       1 H NMR (CDCl 3 , 500 MHz): 8.90 ppm (s, 1H), 8.31 ppm (s, 1H), 2.77-2.82 ppm (m, 2H), 2.35-2.41 ppm (m, 1H), 2.25-2.32 ppm (m, 1H), 1.74 ppm (q, 1H, J=7.37 Hz), 1.38 ppm (s, 3H), 1.23 ppm (s, 3H), 1.11 ppm (s, 3H), 0.95 ppm (d, 3H, J=7.40 Hz), 0.93 ppm (s, 3H). 
     Structure 1 was described as having musky, ambery, and powdery notes. 
     EXAMPLE II 
     
       
                 
         
             
             
         
      
     
     Preparation of 1,1,2,3,3-Pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 2): Dihydrocashmeran was obtained via the hydrogenation of Cashmeran™. A 3 L reaction vessel was charged with dihydrocashmeran (255 g, 1.2 mol), formamidine acetate (642 g, 6.2 mol), and butanol (1.2 L). The reaction mixture was heated to 118° C. for 4 hours and then cooled to 25° C. The reaction mixture was washed twice with brine (1 L) and purified by vacuum distillation to afford a 40:60 cis/trans mixture of 1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (200 g) having a boiling point of 153° C. at a pressure of 2.0 mmHg. The cis/trans structures were confirmed by NMR analysis by GC trapping. 
     Cis-1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene: 
       1 H NMR (CDCl 3 , 500 MHz): 8.96 ppm (s, 1H), 8.39 ppm (s, 1H), 3.00 ppm (d, J=9.7 Hz, 1H), 2.52-2.79 ppm (m, 2H), 1.25-2.15 ppm (m, 4H), 1.42 ppm (s, 3H), 1.10 ppm (s, 3H), 0.92 ppm (s, 3H), 0.84 ppm (d, J=7.3 Hz, 3H), 0.54 ppm (s, 3H). 
     Trans-1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene: 
       1 H NMR (CDCl 3 , 500 MHz): 8.92 ppm (s, 1H), 8.37 ppm (s, 1H), 2.75-2.93 ppm (m, 2H), 2.65 ppm (d, J=12.6 Hz, 1H), 1.20-2.10 ppm (m, 4H), 1.32 ppm (s, 3H), 0.99 ppm (s, 3H), 0.95 ppm (s, 3H), 0.84 ppm (d, J=7.5 Hz, 3H), 0.71 ppm (s, 3H). 
     Structure 2 was described as having ambery, musky, and woody notes. 
     EXAMPLE III 
     
       
                 
         
             
             
         
      
     
     Preparation of Cis-1,1,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 2a): A 500 mL zipper autoclave was charged with 1,1,2,3,3-pentamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (100 g, prepared as above in EXAMPLE I), IPA (100 mL), and palladium on carbon (Pd/C) (1 g). The autoclave was sealed, purged with nitrogen, and then pressurized with hydrogen. The reaction mixture was heated to 180° C. for 4 hours and subsequently cooled to 25° C. The autoclave was vented and purged with nitrogen. The catalyst was removed by filtration through celite. A crude mass containing the major product cis-1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (90%) was obtained. The crude mass was evaluated by gas chromatography olfactometry. Cis-1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene was described as having a musky character. In addition, the minor product in the crude mass, trans-1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 2b) (10%), was also evaluated and described as having an ambery character. 
     EXAMPLE IV 
     
       
                 
         
             
             
         
      
     
     Preparation of 1,1,3,3-Tetramethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 3): A 100 mL reaction flask is charged with 1,1,3,3-tetramethyl-1,2,3,5,6,7-hexahydro-inden-4-one (prepared as described in U.S. Pat. No. 3,927,083) (10 g, 0.05 mol), formamidine acetate (27 g, 0.26 mol), and butanol (C 4 H 9 OH) (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (H 2 SO 4 ) (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 1,1,3,3-tetramethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (˜5 g) is obtained. 
     EXAMPLE V 
     
       
                 
         
             
             
         
      
     
     Preparation of 1,1,3,3-Tetramethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 4): 1,1,3,3-Tetramethyl-octahydro-inden-4-one is first prepared by hydrogenating 1,1,3,3-tetramethyl-1,2,3,5,6,7-hexahydro-inden-4-one (prepared as described in U.S. Pat. No. 3,927,083) with Pd/C in alcohol in a Parr Hydrogenator at 25-60° C. and under 500 psi of hydrogen gas. A 100 mL reaction flask is the charged with 1,1,3,3-tetramethyl-octahydro-inden-4-one (10 g, 0.05 mol), formamidine acetate (27 g, 0.26 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 1,1,3,3-tetramethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (˜5 g) is obtained. 
     EXAMPLE VI 
     
       
                 
         
             
             
         
      
     
     Preparation of 1,1,2,3,3,5-Hexamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 5): A 100 mL reaction flask is charged with 1,1,2,3,3,6-hexamethyl-1,2,3,5,6,7-hexahydro-inden-4-one (prepared as described in U.S. Pat. No. 3,927,083) (10 g, 0.045 mol), formamidine acetate (23 g, 0.22 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 1,1,2,3,3,5-hexamethyl-2,3,4,5-tetrahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (˜5 g) is obtained. 
     EXAMPLE VII 
     
       
                 
         
             
             
         
      
     
     Preparation of 1,1,2,3,3,5-Hexamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 6): 1,1,2,3,3,6-Hexamethyl-octahydro-inden-4-one is first prepared by hydrogenating 1,1,2,3,3,6-hexamethyl-1,2,3,5,6,7-hexahydro-inden-4-one (prepared as described in U.S. Pat. No. 3,927,083) with Pd/C in alcohol in a Parr Hydrogenator at 25-60° C. and under 500 psi of hydrogen gas. A 100 mL reaction flask is the charged with 1,1,2,3,3,6-hexamethyl-octahydro-inden-4-one (10 g, 0.045 mol), formamidine acetate (23 g, 0.22 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 11,1,2,3,3,5-hexamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (˜5 g) is obtained. 
     EXAMPLE VIII 
     
       
                 
         
             
             
         
      
     
     Preparation of 7,7,10,10-Tetramethyl-5,6,7,8,9,10-hexahydro-benzo[h]quinazoline (Structure 7): A 100 mL reaction flask is charged with 5,5,8,8-tetramethyl-3,4,5,6,7,8-hexahydro-2H-naphthalen-1-one (prepared as described in U.S. Pat. Nos. 3,927,083 and 2,912,462) (10 g, 0.048 mol), formamidine acetate (25 g, 0.24 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 7,7,10,10-tetramethyl-5,6,7,8,9,10-hexahydro-benzo[h]quinazoline (˜5 g) is obtained. 
     EXAMPLE IX 
     
       
                 
         
             
             
         
      
     
     Preparation of 7,7,10,10-Tetramethyl-5,6,6a,7,8,9,10,10a-octahydro-benzo[h]quinazoline (Structure 8): 5,5,8,8-Tetramethyl-octahydro-naphthalen-1-one is first prepared by hydrogenating 5,5,8,8-tetramethyl-3,4,5,6,7,8-hexahydro-2H-naphthalen-1-one (prepared as described in U.S. Pat. Nos. 3,927,083 and 2,912,462) with Pd/C in alcohol in a Parr Hydrogenator at 25-60° C. and under 500 psi of hydrogen gas. A 100 mL reaction flask is the charged with 5,5,8,8-tetramethyl-octahydro-naphthalen-1-one (10 g, 0.048 mol), formamidine acetate (25 g, 0.24 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 7,7,10,10-tetramethyl-5,6,6a,7,8,9,10,10a-octahydro-benzo[11]quinazoline (˜5 g) is obtained. 
     EXAMPLE X 
     
       
                 
         
             
             
         
      
     
     Preparation of 5,7,7,8,10,10-Hexamethyl-5,6,7,8,9,10-hexahydro-benzo[h]quinazoline (Structure 9): A 100 mL reaction flask is charged with 3,5,5,6,8,8-hexamethyl-3,4,5,6,7,8-hexahydro-2H-naphthalen-1-one (prepared as described in U.S. Pat. No. 3,927,083) (10 g, 0.042 mol), formamidine acetate (21 g, 0.2 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 5,7,7,8,10,10-hexamethyl-5,6,7,8,9,10-hexahydro-benzo[h]quinazoline (˜5 g) is obtained. 
     EXAMPLE XI 
     
       
                 
         
             
             
         
      
     
     Preparation of 5,7,7,8,10,10-Hexamethyl-5,6,6a,7,8,9,10,10a-octahydro-benzo[h]quinazoline (Structure 10): 3,5,5,6,8,8-Hexamethyl-octahydro-naphthalen-1-one is first prepared by hydrogenating 3,5,5,6,8,8-hexamethyl-3,4,5,6,7,8-hexahydro-2H-naphthalen-1-one (prepared as described in U.S. Pat. No. 3,927,083) with Pd/C in alcohol in a Parr Hydrogenator at 25-60° C. and under 500 psi of hydrogen gas. A 100 mL reaction flask is the charged with 3,5,5,6,8,8-hexamethyl-octahydro-naphthalen-1-one (10 g, 0.042 mol), formamidine acetate (21 g, 0.2 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 5,7,7,8,10,10-hexamethyl-5,6,6a,7,8,9,10,10a-octahydro-benzo[h]quinazoline (˜5 g) is obtained. 
     EXAMPLE XII 
     
       
                 
         
             
             
         
      
     
     Preparation of 7,7,10a-Trimethyl-5,6,6a,7,8,9,10,10a-octahydro-benzo[h]quinazoline (Structure 11) and 6,6,9a-Trimethyl-5,5a,6,7,8,9,9a,10-octahydro-benzo[g]quinazoline (Structure 26): A 100 mL reaction flask is charged with 5,5,8a-trimethyl-octahydro-naphthalen-2-one (prepared as described by Strike in Journal of the American Chemical Society, 1964, 86(10), pages: 2044-2050) (10 g, 0.05 mol), formamidine acetate (27 g, 0.26 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. A mixture of products 5,7,7,8,10,10-hexamethyl-5,6,7,8,9,10-hexahydro-benzo[h]quinazoline and 6,6,9a-Trimethyl-5,5a,6,7,8,9,9a,10-octahydro-benzo[g]quinazoline (˜5 g) is obtained, which may be separated using techniques known to those having skill in the art. Suitable techniques include chromatography such as high performance liquid chromatography, referred to as HPLC, and particularly silica gel chromatography and gas chromatography trapping known as GC trapping. 
     EXAMPLE XIII 
     
       
                 
         
             
             
         
      
     
     Preparation of 8-Isopropyl-5,6,7,8-tetrahydro-quinazoline (Structure 12): A 100 mL reaction flask is charged with 2-isopropyl-cyclohexanone (10 g, 0.07 mol), formamidine acetate (40 g, 0.4 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 8-isopropyl-5,6,7,8-tetrahydro-quinazoline (˜5 g) is obtained. 
     EXAMPLE XIV 
     
       
                 
         
             
             
         
      
     
     Preparation of 8-tert-Butyl-5,6,7,8-tetrahydro-quinazoline (Structure 13): A 100 mL reaction flask is charged with 2-tert-butyl-cyclohexanone (10 g, 0.07 mol), formamidine acetate (40 g, 0.4 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 8-tert-butyl-5,6,7,8-tetrahydro-quinazoline (˜5 g) is obtained. 
     EXAMPLE XV 
     
       
                 
         
             
             
         
      
     
     Preparation of 5-(1,5-Dimethyl-hex-4-enyl)-pyrimidine (Structure 14): A 100 mL reaction flask is charged with 3,7-dimethyl-oct-6-enal (Citronellal®) (Commercially available at IFF) (10 g, 0.06 mol), formamidine acetate (31 g, 0.3 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 5-(1,5-dimethyl-hex-4-enyl)-pyrimidine (˜5 g) is obtained. 
     EXAMPLE XVI 
     
       
                 
         
             
             
         
      
     
     Preparation of 4-tert-Butyl-pyrimidine (Structure 16): A 100 mL reaction flask is charged with 3,3-dimethyl-butan-2-one (10 g, 0.1 mol), formamidine acetate (57 g, 0.5 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 4-tert-butyl-pyrimidine (˜5 g) is obtained. 
     EXAMPLE XVII 
     
       
                 
         
             
             
         
      
     
     Preparation of 4-(2,2-Dimethyl-propyl)-pyrimidine (Structure 16): A 100 mL reaction flask is charged with 4,4-dimethyl-pentan-2-one (10 g, 0.1 mol), formamidine acetate (57 g, 0.5 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 4-(2,2-dimethyl-propyl)-pyrimidine (˜5 g) is obtained. 
     EXAMPLE XVIII 
     
       
                 
         
             
             
         
      
     
     Preparation of 4,5-Diisopropyl-pyrimidine (Structure 17): A 100 mL reaction flask is charged with 2,5-dimethyl-hexan-3-one (10 g, 0.08 mol), formamidine acetate (40 g, 0.4 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 4,5-diisopropyl-pyrimidine (˜5 g) is obtained. 
     EXAMPLE XIX 
     
       
                 
         
             
             
         
      
     
     Preparation of 4,5-Di-tert-butyl-pyrimidine (Structure 18): A 100 mL reaction flask is charged with 2,2,5,5-tetramethyl-hexan-3-one (10 g, 0.06 mol), formamidine acetate (33 g, 0.3 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 4,5-di-tert-butyl-pyrimidine (˜5 g) is obtained. 
     EXAMPLE XX 
     
       
                 
         
             
             
         
      
     
     Preparation of 5-tert-Butyl-4-(2,2-dimethyl-propyl)-pyrimidine (Structure 19): A 100 mL reaction flask is charged with 2,2,6,6-tetramethyl-heptan-4-one (10 g, 0.06 mol), formamidine acetate (33 g, 0.3 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 5-tert-butyl-4-(2,2-dimethyl-propyl)-pyrimidine (˜5 g) is obtained. 
     EXAMPLE XXI 
     
       
                 
         
             
             
         
      
     
     Preparation of 4-(2,6,6-Trimethyl-cyclohex-3-enyl)-pyrimidine (Structure 20): A 100 mL reaction flask is charged with 1-(2,6,6-trimethyl-cyclohex-3-enyl)-ethanone (10 g, 0.06 mol, commercially available at IFF), formamidine acetate (31 g, 0.3 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 4-(2,6,6-trimethyl-cyclohex-3-enyl)-pyrimidine (˜10 g) is obtained. 
     EXAMPLE XXII 
     
       
                 
         
             
             
         
      
     
     Preparation of 4-(3,3-Dimethyl-cyclohexyl)-pyrimidine (Structure 21): A 100 mL reaction flask is charged with 1-(3,3-dimethyl-cyclohexyl)-ethanone (Herbac®) (10 g, 0.06 mol, commercially available at IFF), formamidine acetate (31 g, 0.3 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 4-(3,3-dimethyl-cyclohexyl)-pyrimidine (˜10 g) is obtained. 
     EXAMPLE XXIII 
     
       
                 
         
             
             
         
      
     
     Preparation of 4-[2-(2,6,6-Trimethyl-cyclohex-1-enyl)-ethyl]-pyrimidine (Structure 22): A 100 mL reaction flask is charged with 4-(2,6,6-trimethyl-cyclohex-1-enyl)-butan-2-one (10 g, 0.05 mol, commercially available at IFF), formamidine acetate (26 g, 0.3 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 4-[2-(2,6,6-trimethyl-cyclohex-1-enyl)-ethyl]-pyrimidine (˜10 g) is obtained. 
     EXAMPLE XXIV 
     
       
                 
         
             
             
         
      
     
     Preparation of 4-[2-(2,5,6,6-Tetramethyl-cyclohex-1-enyl)-ethyl]-pyrimidine (Structure 23): A 100 mL reaction flask is charged with 4-(2,5,6,6-tetramethyl-cyclohex-1-enyl)-butan-2-one (10 g, 0.05 mol, commercially available at IFF), formamidine acetate (26 g, 0.3 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 4-[2-(2,5,6,6-tetramethyl-cyclohex-1-enyl)-ethyl]-pyrimidine (˜10 g) is obtained. 
     EXAMPLE XXV 
     
       
                 
         
             
             
         
      
     
     Preparation of 4-(1,1,2,3,3-Pentamethyl-indan-5-yl)-pyrimidine (Structure 24): A 5 L reaction vessel was charged with 1-(1,1,2,3,3-pentamethyl-indan-5-yl)-ethanone (460 g, 2.0 mol) (commercially available at IFF), formamidine acetate (675 g, 6.4 mol), and butanol (1.0 L). The reaction mixture was heated to 120° C. for 10 hours and then cooled to 25° C. The reaction mixture was washed twice with brine (1 L) and purified by vacuum distillation to afford 4-(1,1,2,3,3-pentamethyl-indan-5-yl)-pyrimidine (200 g) having a boiling point of 153° C. at a pressure of 2.0 mmHg 
       1 H NMR (CDCl 3 , 500 MHz): 9.25 ppm (d, 1H, J=1.28 Hz), 8.71 ppm (d, 1H, J=5.40 Hz), 7.88-7.93 ppm (m, 2H), 7.69 (d, 1H, J=5.40 Hz, of d, J=1.40 Hz), 7.28 ppm (d, 1H, J=7.90 Hz, of d, J=0.40 Hz), 1.92 ppm (q, 1H, J=7.36 Hz), 1.35 ppm (s, 3H), 1.31 ppm (s, 3H), 1.13 ppm (s, 3H), 1.11 ppm (s, 3H), 1.02 ppm (d, 3H, J=7.36 Hz). 
     4-(1,1,2,3,3-Pentamethyl-indan-5-yl)-pyrimidine was described as having weak floral note. 
     EXAMPLE XXVI 
     
       
                 
         
             
             
         
      
     
     Preparation of 4-(6-tert-Butyl-1,1-dimethyl-indan-4-yl)-pyrimidine (Structure 25): A 5 L reaction vessel was charged with 1-(6-tert-butyl-1,1-dimethyl-indan-4-yl)-ethanone (300 g, 1.2 mol) (commercially available at IFF), formamidine acetate (639 g, 6.1 mol), and butanol (1.0 L). The reaction mixture was heated to 125° C. for 10 hours and then cooled to 25° C. The reaction mixture was washed twice with brine (1 L) and purified by vacuum distillation to afford 4-(6-tert-butyl-1,1-dimethyl-indan-4-yl)-pyrimidine (200 g) having a boiling point of 180° C. at a pressure of 0.5 mmHg 
       1 H NMR (CDCl 3 , 500 MHz): 9.28 ppm (d, 1H, J=1.28 Hz), 8.74 ppm (d, 1H, J=5.32 Hz), 7.65 ppm (d, 1H, J=1.84 Hz), 7.57 ppm (d, 1H, J=5.32 Hz, of d, J=1.44 Hz), 7.31 ppm (d, 1H, J=1.80 Hz), 3.11 ppm (t, 2H, J=7.14 Hz), 1.95 ppm (t, 2H, J=7.14 Hz), 1.38 ppm (s, 9H), 1.31 ppm (s, 6H). 
     4-(6-tert-Butyl-1,1-dimethyl-indan-4-yl)-pyrimidine was described as having weak fatty note. 
     EXAMPLE XXVII 
     
       
                 
         
             
             
         
      
     
     Preparation of 5a,10-Dimethyl-5,5a,6,7,8,9-hexahydro-benzo[g]quinazoline (Structure 27): A 100 mL reaction flask is charged with 1,4a-dimethyl-4,4-a,5,6,7,8-hexahydro-3H-naphthalen-2-one (prepared as described by Sjoebers in Acta Chemica Scand., 1990, 44(10), pages: 1036-1041) (10 g, 0.05 mol), formamidine acetate (27 g, 0.26 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 5a,10-dimethyl-5,5a,6,7,8,9-hexahydro-benzo[g]quinazoline (˜5 g) is obtained. 
     EXAMPLE XXVIII 
     
       
                 
         
             
             
         
      
     
     Preparation of 5a,10-Dimethyl-5,5a,6,7,8,9,9a,10-octahydro-benzo[g]quinazoline (Structure 28): 1,4a-Dimethyl-octahydro-naphthalen-2-one is first prepared by hydrogenating 1,4a-dimethyl-4,4-a,5,6,7,8-hexahydro-3H-naphthalen-2-one (prepared as described by Sjoebers in Acta Chemica Scand., 1990, 44(10), pages: 1036-1041) with Pd/C in alcohol in a Parr Hydrogenator at 25-60° C. and under 500 psi of hydrogen gas. A 100 mL reaction flask is charged with 1,4a-dimethyl-octahydro-naphthalen-2-one (10 g, 0.05 mol), formamidine acetate (27 g, 0.26 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 5a,10-dimethyl-5,5a,6,7,8,9,9a,10-octahydro-benzo[g]quinazoline (˜5 g) is obtained. 
     EXAMPLE XXIX 
     
       
                 
         
             
             
         
      
     
     Preparation of 6,6,10,10-Tetramethyl-5,7,8,9,10,10a-hexahydro-6H-6a,9-methanobenzo[H]quinazoline (Structure IV): A 5 L reaction vessel was charged with 1,1,5,5-tetramethyl-hexahydro-2,4-a-methano-naphthalen-8-one (440 g, 2.0 mol) (commercially available at IFF), formamidine acetate (1040 g, 10.0 mol) and butanol (2 L). The reaction mixture was heated to 120° C. for 10 hours and then cooled to 25° C. The reaction mixture was washed twice with brine (1 L) and purified by vacuum distillation to afford crude product 6,6,10,10-tetramethyl-5,7,8,9,10,10a-hexahydro-6H-6a,9-methanobenzo[H]quinazoline (430 g) having a boiling point of 159° C. at a pressure of 1.0 mmHg. Further recrystallization from ethanol afforded 6,6,10,10-tetramethyl-5,7,8,9,10,10a-hexahydro-6H-6a,9-methanobenzo[H]quinazoline (95% purity) (125 g) with a melting point of 44-45° C. 
       1 H NMR (CDCl 3 , 500 MHz): 8.97 ppm (d, 1H, J=0.60 Hz), 8.34 ppm (s, 1H), 2.81 ppm (d, 1H, J=16.14 Hz), 2.45 ppm (s, 1H), 2.30 ppm (d, 1H, J=16.11 Hz), 1.90-1.97 ppm (m, 1H), 1.76-1.77 ppm (m, 1H), 1.71 ppm (d, 1H, J=3.95 Hz, of t, J=12.22 Hz), 1.61-1.66 ppm (d, 1H, J=9.45 Hz, of m), 1.51-1.58 ppm (m, 1H), 1.39 ppm (s, 3H), 1.28 ppm (d, 1H, J=9.95 Hz, of t, J=1.68 Hz), 1.16-1.23 ppm (m, 1H), 1.09 ppm (s, 3H), 0.74 ppm (s, 3H), 0.67 ppm (s, 3H). 
     6,6,10,10-Tetramethyl-5,7,8,9,10,10a-hexahydro-6H-6a,9-methanobenzo[H]quinazoline was described as having musky, woody, and ambery notes. 
     EXAMPLE XXX 
     
       
                 
         
             
             
         
      
     
     Preparation of 5,7,7,10-Tetramethyl-6,7,7a,8,9,10-hexahydro-5H-6,10a-methanoazuleno[5,4-d]pyrimidine (Structure 30): A 100 mL reaction flask is charged with 3,6,8,8-tetramethyl-hexahydro-3a,7-methano-azulen-5-one (prepared as described in U.S. Pat. No. 3,887,622) (10 g, 0.045 mol), formamidine acetate (21 g, 0.2 mol), and butanol (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sulfuric acid (10%, 100 mL) followed by twice with brine (30 mL). Butanol is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 5,7,7,10-tetramethyl-6,7,7a, 8,9,10-hexahydro-5H-6,10a-methanoazuleno[5,4-d]pyrimidine (˜5 g) is obtained. 
     EXAMPLE XXXI 
     
       
                 
         
             
             
         
      
     
     Preparation of 5,6,7,8-Tetrahydro-6,6,7,8,8-pentamethyl-4H-indeno[5,4-D]isoxazole (Structure 31): A 2 L reaction flask was charged with sodium hydride (NaH) (40 g) in dimethoxyethane (DME) (CH 3 OCH 2 CH 2 OCH 3 ) (1.39 Kg) and a mixture of Cashmeran™ (520 g) and ethyl formate (185 g) at room temperature. The mixture was stirred for 8 hours to provide 1,1,2,3,3-pentamethyl-4-oxo-2,3,4,5,6,7-hexahydro-1H-indene-5-carbaldehyde. Dimethylformamide (DMF) (300 mL) and hydroxylamine hydrochloride (NH 2 OH*HC1) (174 g) were then added and the temperature was heated to and maintained at 130° C. for 8 hours. Water was then added and the organic layer was extracted by toluene and washed once with water. Toluene was distilled off using a Rotovap to provide crude product 5,6,7,8-tetrahydro-6,6,7,8,8-pentamethyl-4H-indeno[5,4-D]isoxazole (260 g), which was then recrystallized to afford a pure product with a melting point of 80.96° C. 
       1 H NMR (CDCl 3 , 500 MHz): 8.01 ppm (s, 1H), 2.68-2.73 ppm (m, 2H), 2.28-2.43 ppm (m, 2H), 1.75 ppm (q, 1H, J=7.40 Hz), 1.31 ppm (s, 3H), 1.09 ppm (s, 3H), 1.07 ppm (s, 3H), 0.93 ppm (s, 3H), 0.93 ppm (d, 3H, J=7.40 Hz). 
     5,6,7,8-Tetrahydro-6,6,7,8,8-pentamethyl-4H-indeno[5,4-D]isoxazole was described as having cashmeran, slightly musky, geranium, and hint of ambery notes. 
     EXAMPLE XXXII 
     
       
                 
         
             
             
         
      
     
     Preparation of 5,5a,6,7,8,8a-Hexahydro-6,6,7,8,8-pentamethyl-4H-indeno[5,4-D]isoxazole (Structure 32): A 2 L reaction flask was charged with sodium hydride (24 g) in DME (867 g) and a mixture of dihydrocashmeran (208 g, prepared as above in EXAMPLE II) and ethyl formate (111 g) at room temperature. The mixture was stirred for 8 hours to provide 1,1,2,3,3-pentamethyl-4-oxo-octahydro-indene-5-carbaldehyde. Tetrahydrofuran (THF) (20 mL), ethanol (CH 3 CH 2 OH) (200 mL), hydroxylamine hydrochloride (70 g), and acetic acid (CH 3 COOH) (200 mL) were then added and the temperature was heated to and maintained at 75° C. for 8 hours. Water was then added and the organic layer was extracted by toluene and washed once with water. Toluene was distilled off using a Rotovap to provide crude product 5,5a,6,7,8,8a-hexahydro-6,6,7,8,8-pentamethyl-4H-indeno[5,4-D]isoxazole (186 g), which was then recrystallized to afford a pure product with a melting point of 82.35° C. 
       1 H NMR (CDCl 3 , 400 MHz): 8.03 ppm (s, 1H), 2.57-2.64 ppm (m, 2H), 2.40-2.50 ppm (m, 1H), 1.88-1.94 ppm (m, 1H), 1.61 ppm (d, 1H, J=2.24 Hz, of t, J=12.42 Hz), 1.43 ppm (q, 1H, J=7.53 Hz), 1.30-1.39 ppm (m, 1H), 1.19 ppm (s, 3H), 1.00 ppm (s, 3H), 0.94 ppm (s, 3H), 0.84 ppm (d, 3H, J=7.52 Hz), 0.70 ppm (s, 3H). 
     5,5a,6,7,8,8a-Hexahydro-6,6,7,8,8-pentamethyl-4H-indeno[5,4-D]isoxazole was described as having woody, earthy, green, patchouli, cashmeran, moldy, cucumber, aldehydic, moss and ambery notes. 
     EXAMPLE XXXIII 
     
       
                 
         
             
             
         
      
     
     Preparation of 6,6,7,8,8-Pentamethyl-5,6,7,8-tetrahydro-4H-1-oxa-3-aza-as-indacene (Structure 33) and 6,6,7,8,8-Pentamethyl-5,6,7,8-tetrahydro-4H-indeno[4,5-d]oxazole (Structure 34): 1,1,2,3,3-Pentamethyl-2,3,6,7-tetrahydro-1H-indene-4,5-dione is first prepared with 1,1,2,3,3-pentamethyl-1,2,3,5,6,7-hexahydro-inden-4-one (Cashmeran®) (commercially available at IFF) via oxidation with (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl (TEMPO) (prepared as described by Barton in Tetrahedron Letters, 1984, 25(6), pages: 603-606). A 100 mL reaction flask is charged with 1,1,2,3,3-pentamethyl-2,3,6,7-tetrahydro-1H-indene-4,5-dione (10 g, 0.04 mol) and formamide (NH 2 CHO) (50 mL). The reaction mixture is heated to 200° C. and stirred for 24 hours. The crude mass is diluted with toluene (50 mL) and then washed once with aqueous sodium carbonate (10%, 100 mL) followed by twice with brine (30 mL). Toluene is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product of a mixture of 6,6,7,8,8-pentamethyl-5,6,7,8-tetrahydro-4H-1-oxa-3-aza-as-indacene and 6,6,7,8,8-pentamethyl-5,6,7,8-tetrahydro-4H-indeno[4,5-d]oxazole (˜10 g) is obtained. 
     EXAMPLE XXXIV 
     
       
                 
         
             
             
         
      
     
     Preparation of 6,6,7,8,8-Pentamethyl-5,5a,6,7,8,8a-hexahydro-4H-1-oxa-3-aza-as-indacene (Structure 35) and 6,6,7,8,8-Pentamethyl-5,5a,6,7,8,8a-hexahydro-4H-indeno[4,5-d]oxazole (Structure 36): 1,1,2,3,3-Pentamethyl-octahydro-inden-4-one is first prepared by the hydrogenation of 1,1,2,3,3-pentamethyl-1,2,3,5,6,7-hexahydro-inden-4-one (Cashmeran®) (commercially available at IFF). 1,1,2,3,3-Pentamethyl-hexahydro-indene-4,5-dione is subsequently prepared with 1,1,2,3,3-pentamethyl-octahydro-inden-4-one (prepared as described by Barton in Tetrahedron Letters, 1984, 25(6), pages: 603-606). A 100 mL reaction flask is charged with 1,1,2,3,3-pentamethyl-hexahydro-indene-4,5-dione (10 g, 0.04 mol) and formamide (50 mL). The reaction mixture is heated to 200° C. and stirred for 24 hours. The crude mass is diluted with toluene (50 mL) and then washed once with aqueous sodium carbonate (10%, 100 mL) followed by twice with brine (30 mL). Toluene is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product of a mixture of 6,6,7,8,8-pentamethyl-5,5a,6,7,8,8a-hexahydro-4H-1-oxa-3-aza-as-indacene and 6,6,7,8,8-pentamethyl-5,5a,6,7,8,8a-hexahydro-4H-indeno[4,5-d]oxazole (˜10 g) is obtained. 
     EXAMPLE XXXV 
     
       
                 
         
             
             
         
      
     
     Preparation of 2,6,6,7,8,8-Hexamethyl-5,6,7,8-tetrahydro-4H-3-thia-1-aza-as-indacene (Structure 37): 1,1,2,3,3-Pentamethyl-2,3,6,7-tetrahydro-1H-indene-4,5-dione is first prepared with 1,1,2,3,3-pentamethyl-1,2,3,5,6,7-hexahydro-inden-4-one (Cashmeran®) (commercially available at IFF) via oxidation with (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl (TEMPO) (prepared as described by Barton in Tetrahedron Letters, 1984, 25(6), pages: 603-606). A 100 mL reaction flask is charged with 1,1,2,3,3-pentamethyl-2,3,6,7-tetrahydro-1H-indene-4,5-dione (10 g, 0.04 mol), thioacetamide (CH 3 CSNH 2 ) (3.5 g, 0.04 mol), and diglyme (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sodium carbonate (10%, 100 mL) followed by twice with brine (30 mL). Diglyme is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 2,6,6,7,8,8-hexamethyl-5,6,7,8-tetrahydro-4H-3-thia-1-aza-as-indacene (˜10 g) is obtained. 
     EXAMPLE XXXVI 
     
       
                 
         
             
             
         
      
     
     Preparation of 2,6,6,7,8,8-Hexamethyl-5,5a,6,7,8,8a-hexahydro-4H-3-thia-1-aza-as-indacene (Structure 38): 1,1,2,3,3-Pentamethyl-octahydro-inden-4-one is first prepared by the hydrogenation of 1,1,2,3,3-pentamethyl-1,2,3,5,6,7-hexahydro-inden-4-one (Cashmeran®) (commercially available at IFF). 1,1,2,3,3-Pentamethyl-hexahydro-indene-4,5-dione is subsequently prepared with 1,1,2,3,3-pentamethyl-octahydro-inden-4-one (prepared as described by Barton in Tetrahedron Letters, 1984, 25(6), pages: 603-606). A 100 mL reaction flask is charged with 1,1,2,3,3-pentamethyl-hexahydro-indene-4,5-dione (10 g, 0.04 mol), thioacetamide (3.5 g, 0.04 mol), and diglyme (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The crude mass is washed once with aqueous sodium carbonate (10%, 100 mL) followed by twice with brine (30 mL). Diglyme is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 2,6,6,7,8,8-hexamethyl-5,5a,6,7,8,8a-hexahydro-4H-3-thia-1-aza-as-indacene (˜10 g) is obtained. 
     EXAMPLE XXXVII 
     
       
                 
         
             
             
         
      
     
     Preparation of 7,7,8,9,9-Pentamethyl-5,7,8,9-tetrahydro-6H-cyclopenta[f]quinoxaline (Structure 39): 1,1,2,3,3-Pentamethyl-2,3,6,7-tetrahydro-1H-indene-4,5-dione is first prepared with 1,1,2,3,3-pentamethyl-1,2,3,5,6,7-hexahydro-inden-4-one (Cashmeran®) (commercially available at IFF) via oxidation with (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl (TEMPO) (prepared as described by Barton in Tetrahedron Letters, 1984, 25(6), pages: 603-606). A 100 mL reaction flask is charged with 1,1,2,3,3-pentamethyl-2,3,6,7-tetrahydro-1H-indene-4,5-dione (10 g, 0.04 mol), ethylene diamine (NH 2 CH 2 CH 2 NH 2 ) (2.5 g, 0.04 mol), and diglyme (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The reaction mixture is then cooled to 25° C. and further oxidized with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (10 g, 0.045 mol) for another 8 hours. The crude mass is washed once with aqueous sodium carbonate (10%, 100 mL) followed by twice with brine (30 mL). Diglyme is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 7,7,8,9,9-pentamethyl-5,7,8,9-tetrahydro-6H-cyclopenta[f]quinoxaline (˜10 g) is obtained. 
     EXAMPLE XXXVIII 
     
       
                 
         
             
             
         
      
     
     Preparation of 7,7,8,9,9-Pentamethyl-5,6a,7,8,9,9a-hexahydro-6H-cyclopenta[f]quinoxaline (Structure 40): 1,1,2,3,3-Pentamethyl-octahydro-inden-4-one is first prepared by the hydrogenation of 1,1,2,3,3-pentamethyl-1,2,3,5,6,7-hexahydro-inden-4-one (Cashmeran®) (commercially available at IFF). 1,1,2,3,3-Pentamethyl-hexahydro-indene-4,5-dione is subsequently prepared with 1,1,2,3,3-pentamethyl-octahydro-inden-4-one (prepared as described by Barton in Tetrahedron Letters, 1984, 25(6), pages: 603-606). A 100 mL reaction flask is charged with 1,1,2,3,3-pentamethyl-hexahydro-indene-4,5-dione (10 g, 0.04 mol), ethylene diamine (NH 2 CH 2 CH 2 NH 2 ) (2.5 g, 0.04 mol), and diglyme (50 mL). The reaction mixture is heated to 130° C. and stirred for 24 hours. The reaction mixture is then cooled to 25° C. and further oxidized with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (10 g, 0.045 mol) for another 8 hours. The crude mass is washed once with aqueous sodium carbonate (10%, 100 mL) followed by twice with brine (30 mL). Diglyme is recovered by roto-evaporation. The crude product is further purified with liquid chromatography (Biotage® system) and then crystallized. Product 7,7,8,9,9-pentamethyl-5,6a,7,8,9,9a-hexahydro-6H-cyclopenta[f]quinoxaline (˜10 g) is obtained. 
     EXAMPLE XXXIX 
     The fragrance formulas exemplified as follows demonstrated that the addition of 1,1,2,3,3-Pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 2) containing a 40:60 cis/trans isomeric mixture provided a musky character to the fragrance formula. 
     
       
         
               
               
               
               
             
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredient 
                 Parts (g) 
                 Parts (g) 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Kharismal ™ 
                 175 
                 175 
               
               
                   
                 Ethylene Brassylate 
                 50 
                 50 
               
               
                   
                 Dipropylene Glycol 
                 34 
                 34 
               
               
                   
                 Iso Gamma Super ™ 
                 30 
                 30 
               
               
                   
                 Hydroxy Citronellal Pure 
                 15 
                 15 
               
               
                   
                 Indasan 
                 10 
                 10 
               
               
                   
                 Amberiff 20% IPM 
                 10 
                 10 
               
               
                   
                 L-Citronellol 
                 8 
                 8 
               
               
                   
                 Beta Ionone Extra 
                 5 
                 5 
               
               
                   
                 Linalyl Acetate 
                 5 
                 5 
               
               
                   
                 Ambrettolide 
                 3 
                 3 
               
               
                   
                 Geraniol 980 
                 3 
                 3 
               
               
                   
                 Healingwood ™ 
                 1 
                 1 
               
               
                   
                 Amber Xtreme ™ 1% DPG 
                 1 
                 1 
               
               
                   
                 Structure 2 
                 10 
                 — 
               
               
                   
                 DPG 
                 — 
                 10 
               
               
                   
                 Total 
                 360 
                 360 
               
               
                   
                   
               
             
          
         
       
     
     The above fragrance formulas had floral and woody characters. The addition of 1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 2) intensified the floral and woody notes and provided a musky undertone. 
     EXAMPLE XL 
     Fragrance formulation containing 1,1,2,3,3-pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 2): 
     
       
         
               
               
               
             
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredient 
                 Parts (g) 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Santaliff ™ 
                 24 
               
               
                   
                 Phenoxanol ™ 
                 32 
               
               
                   
                 Coumarin 
                 28 
               
               
                   
                 Cyclamal Extra 
                 1 
               
               
                   
                 Eth Vanillin 
                 7 
               
               
                   
                 Geraniol 980 Pure 
                 1 
               
               
                   
                 Hedione ™ 
                 60 
               
               
                   
                 Amy Cinnamic Aldehyde 
                 60 
               
               
                   
                 Heliotropine 
                 17 
               
               
                   
                 Hexyl Cinnamic Ald 
                 16 
               
               
                   
                 Beta Ionone Extra 
                 6 
               
               
                   
                 Iso E Super ™ 
                 70 
               
               
                   
                 Lyral ™ 
                 16 
               
               
                   
                 lillial ™ 
                 160 
               
               
                   
                 Lilianth 
                 20 
               
               
                   
                 Methyl Ionone Gamma A 
                 73 
               
               
                   
                 Veramoss 
                 2 
               
               
                   
                 Peru Balsam Oil India 
                 3 
               
               
                   
                 Prenyl Acetate 
                 1 
               
               
                   
                 Methyl Cedryl Ketone 
                 40 
               
               
                   
                 Methyl Phenyl Acetate 
                 1 
               
               
                   
                 Aubepine 
                 4 
               
               
                   
                 Benzoin 
                 10 
               
               
                   
                 Cedrol Tex 
                 3 
               
               
                   
                 Citronellol Extra 
                 3 
               
               
                   
                 Geraniol Coeur 
                 4 
               
               
                   
                 Methyl Cinnamate 
                 3 
               
               
                   
                 Styrax Alva Ess 
                 2 
               
               
                   
                 Vanillin ex Lignin 
                 12 
               
               
                   
                   Cananga  Java Native 
                 5 
               
               
                   
                 Structure 2 
                 20 
               
               
                   
                 Total 
                 704 
               
               
                   
                   
               
             
          
         
       
     
     1,1,2,3,3-Pentamethyl-2,3,3a,4,5,9b-hexahydro-1H-7,9-diaza-cyclopenta[a]naphthalene (Structure 2) imparted diffusive floral and soft powdery characters to a fragrance formula. 
     EXAMPLE XLI 
     The fragrance formulas exemplified as follows demonstrated that the addition of 6,6,10,10-tetramethyl-5,7,8,9,10,10a-hexahydro-6H-6a, 9-methanobenzo[H]quinazoline (Structure 29) provided floral odor character with woody and musky undertones. 
     
       
         
               
               
               
               
             
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredient 
                 Parts (g) 
                 Parts (g) 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Triplal BHT 
                 20 
                 20 
               
               
                   
                 Aldehyde C11 Ulenic 
                 13 
                 13 
               
               
                   
                 Aldehyde C12 MNA 
                 10 
                 10 
               
               
                   
                 Iso Gamma Super ™ 
                 170 
                 170 
               
               
                   
                 Hydroxy Citronellal Pure 
                 10 
                 10 
               
               
                   
                 Bacdanol ™ BHT 
                 10 
                 10 
               
               
                   
                 Benz Acetone 
                 25 
                 25 
               
               
                   
                 Benz Salicylate 
                 50 
                 50 
               
               
                   
                 Citronellol 950 
                 15 
                 15 
               
               
                   
                 Cyclacet 
                 20 
                 20 
               
               
                   
                 Cyclaprop 
                 20 
                 20 
               
               
                   
                 Damascone delta 
                 2 
                 2 
               
               
                   
                 Dihydro myrcenol 
                 60 
                 60 
               
               
                   
                 Eugenol Natural 
                 10 
                 10 
               
               
                   
                 Galaxolide 50 ™ 
                 140 
                 140 
               
               
                   
                 Hexyl cinnamic ald 
                 35 
                 35 
               
               
                   
                 Hexyl Salicylate 
                 35 
                 35 
               
               
                   
                 Iso bornyl acetate 
                 40 
                 40 
               
               
                   
                 Iao butyl quinoline 
                 1 
                 1 
               
               
                   
                 Methyl ionone gamma 
                 15 
                 15 
               
               
                   
                 Peomosa ™ 
                 25 
                 25 
               
               
                   
                 Rosetone 
                 60 
                 60 
               
               
                   
                 Styralyl acetate 
                 1 
                 1 
               
               
                   
                 Terpineol alpha 
                 3 
                 3 
               
               
                   
                 Gamma undecalactone 
                 6 
                 6 
               
               
                   
                 Veramoss 
                 1 
                 1 
               
               
                   
                 Verdox 
                 40 
                 40 
               
               
                   
                 Yara Yara 
                 1 
                 1 
               
               
                   
                 Structure 29 
                 30 
                 — 
               
               
                   
                 DPG 
                 — 
                 30 
               
               
                   
                 Total 
                 868 
                 868 
               
               
                   
                   
               
             
          
         
       
     
     EXAMPLE XLII 
     The fragrance formula exemplified as follows demonstrated that 6,6,10,10-Tetramethyl-5,7,8,9,10,10a-hexahydro-6H-6a, 9-methanobenzo[H]quinazoline (Structure 29) imparted diffusive floral, soft powdery, and sweet characters. 
     
       
         
               
               
               
             
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredient 
                 Parts (g) 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Santaliff ™ 
                 24 
               
               
                   
                 Phenoxanol ™ 
                 32 
               
               
                   
                 Coumarin 
                 28 
               
               
                   
                 Cyclamal Extra 
                 1 
               
               
                   
                 Eth Vanillin 
                 7 
               
               
                   
                 Geraniol 980 Pure 
                 1 s 
               
               
                   
                 Hedione ™ 
                 60 
               
               
                   
                 Amy Cinnamic Aldehyde 
                 60 
               
               
                   
                 Heliotropine 
                 17 
               
               
                   
                 Hexyl Cinnamic Ald 
                 16 
               
               
                   
                 Beta Ionone Extra 
                 6 
               
               
                   
                 Iso E Super ™ 
                 70 
               
               
                   
                 Lyral ™ 
                 16 
               
               
                   
                 lillial ™ 
                 160 
               
               
                   
                 Lilianth 
                 20 
               
               
                   
                 Methyl Ionone Gamma A 
                 73 
               
               
                   
                 Veramoss 
                 2 
               
               
                   
                 Peru Balsam Oil India 
                 3 
               
               
                   
                 Prenyl Acetate 
                 1 
               
               
                   
                 Methyl Cedryl Ketone 
                 40 
               
               
                   
                 Methyl Phenyl Acetate 
                 1 
               
               
                   
                 Aubepine 
                 4 
               
               
                   
                 Benzoin 
                 10 
               
               
                   
                 Cedrol Tex 
                 3 
               
               
                   
                 Citronellol Extra 
                 3 
               
               
                   
                 Geraniol Coeur 
                 4 
               
               
                   
                 Methyl Cinnamate 
                 3 
               
               
                   
                 Styrax Alva Ess 
                 2 
               
               
                   
                 Vanillin ex Lignin 
                 12 
               
               
                   
                   Cananga  Java Native 
                 5 
               
               
                   
                 Structure 29 
                 20 
               
               
                   
                 Total 
                 704