Abstract:
4(5)-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene having the formula ##STR1## its synthesis, its use as a perfumery agent and as an olfactant component in perfumery compositions and as an odorant for technical products.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to the isomeric mixture 4(5)-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene, its preparation and its use in perfumery. The compound is a valuable, new fragrance with a strong, warm, woody aroma. 
     OBJECTS OF THE INVENTION 
     An object of the present invention is the obtaining of the isomeric mixture 4(5)-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene. 
     Another object of the present invention is the development of a process for the production of said isomeric mixture 4(5) -acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene. 
     A further object of the present invention is the development of a perfumery composition consisting essentially of from 1% to 50% by weight of the isomeric mixture 4(5)-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene and the remainder customary constituents of perfumery compositions. 
     A yet further object of the present invention is the development of a method of imparting a pleasant odor to a product comprising adding a sufficient amount of the above perfumery composition to provide the desired degree of odor. 
     These and other objects of the invention will become more apparent as the description thereof proceeds. 
     DESCRIPTION OF THE INVENTION 
     The above objects have been achieved by the novel isomeric mixture 4(5)-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene having the formula ##STR2## This isomeric mixture has physical properties and odorant properties that make it a valuable odorant with a strong, warm, woody scent and good odor persistency. 
     The new isomer mixture according to the invention is prepared by well-known methods of synthesis of organic chemistry. The commercial terpene derivative nopol is used as starting material for the synthesis. This can be dehydrated to nopadiene in a known manner, as described, for example, by Ohloff and Schade in Angewandte Chemie 67, 427 (1955). The isomer mixture according to the invention is obtained by the reaction of nopadiene with methyl vinyl ketone in a Diels-Alder reaction. For this purpose, it is most practical to heat the two starting components nopadiene and methyl vinyl ketone in the autoclave for several hours, at a temperature of about 160° C. The product obtained after fractionation is a mixture of structural or stereoisomers with respect to positions 4, 5 and 6. The synthesis is carried out according to the following reaction diagram: ##STR3## 
     The new fragrance thus represents a mixture of the following structural isomers: 
     4-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene, and 
     5-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene. 
     In addition, the 5 and 6 carbon atoms can be in the cis or trans configuration, or a mixture. 
     The isomer mixture 4(5)-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene is characterized by a strong, warm, woody scent as well as a good staying power. Another advantage is its very good ability to combine into novel compositions, to which it lends a good staying power and interesting scent nuances as well. 
     The isomer mixture 4(5)-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene can be mixed with other fragrances in the most varied proportions to form new perfumery compositions. Its content in the perfumery compositions generally will be between 1% and 50% by weight, related to the total composition. 
     Such compositions can be used directly as perfumes or for perfuming cosmetic preparations such as cremes, lotions, colognes or toilet waters, aerosols, toilet soaps, etc. They also may be used to improve the smell of technical products such as washing and cleaning agents, softeners, and agents for the treating of textiles. For the scenting of the various products, the compositions generally are added to the former in concentrations of 0.05% to 2% by weight, related to the total product. 
    
    
     The following examples illustrate the subject matter of the invention in more detail without limiting it, however, to these examples. 
     EXAMPLE 1 
     Preparation of 4(5)-Acetyl-9,9-Dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene 
     148.2 gm (1 mol) of nopadiene freshly prepared from nopol and 70.1 gm (1 mol) of methyl vinyl ketone were heated for 6 hours in an autoclave under a pressure of 5 bar of nitrogen at 160° C. After the removal of the foreruns by distillation, the crude product was fractionated under high vacuum. Obtained were 110 gm, that is, 50% of the theoretical yield, of the isomeric mixture of 4(5)-acetyl-9,9-dimethyltricyclo-[4,4,0,1 8 ,10 ]-undec-1-ene with the following analytical data: 
     Boiling point: 78°-80° C. at 0.01 mbar. 
     Refractive index n D   20  =1.5132. 
     IR (film): 1710 cm -1  (ketone). 
       1  H-NMR(CCL 4 ): δ=5.18 ppm (m, 1H, C=CH). 
     The product had a strong, warm, woody scent. 
     EXAMPLE 2 
     Fragrance Composition Woody Base for Men&#39;s Cologne 
     
         ______________________________________              Parts by Weight______________________________________4(5)-Acetyl-9,9-dimethyltricyclo- [4,4,0,1.sup.8,10 ]-undec-1-ene                300Hexylcinnamaldehyde  80Linalyl acetate      80Lyral (IFF)          60γ-Methionone   60Patchouli oil        50Terpinyl acetate     50Galaxolide (IFF)     50Coumarin             40Amyl salicylate      40p-tert.-Butylcyclohexyl acetate                40Benzyl acetate       30Muscatel sage oil    30Aldehyde C12 (10% in DPG)                30Lemon grass oil      20Vetiveryl acetate    20Geranium oil         10Rose oxide (10% in DPG)                10                1,000______________________________________ 
    
     The preceding specific embodiments are illustrative of the practice of the invention. It is to be understood, however, that other expedients known to those skilled in the art or disclosed herein, may be employed without departing from the spirit of the invention or the scope of the appended claims.