Abstract:
A perfumery composition consisting essentially of from 1% to 50% by weight of a trimethyl-tetrahydropyran-2-one selected from the group consisting of 
     (1) 4,6,6-trimethyl-tetrahydropyran-2-one of the formula ##STR1## (2) 4,4,6-trimethyl-tetrahydropyran-2-one of the formula ##STR2## and (3) mixtures of (1) and (2), 
     and the remainder customary constituents of perfumery compositions; as well as the method of imparting a pleasing odor utilizing said trimethyl-tetrahydropyran-2-ones.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to perfumery compositions containing certain trimethyl-tetrahydropyran-2-ones and method of imparting a pleasant odor to industrial products employing the same. 
     OBJECTS OF THE INVENTION 
     An object of the present invention is the development of a perfumery composition with a characteristic fragrance with a walnut nuance. 
     A further object of the present invention is the development of a perfumery composition consisting essentially of from 1% to 50% by weight of a trimethyl-tetrahydropyran-2-one selected from the group consisting of 
     (1) 4,6,6-trimethyl-tetrahydropyran-2-one of the formula ##STR3## (2) 4,4,6-trimethyl-tetrahydropyran-2-one of the formula ##STR4## and (3) mixtures of (1) and (2), 
     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 pleasing odor to a product comprising adding to said product from 0.05% to 5% by weight of the perfumery composition given above, as a scenting agent. 
     These and other objects of the invention will become more apparent as the description thereof proceeds. 
     DESCRIPTION OF THE INVENTION 
     We have now found that trimethyl-tetrahydropyran-2-ones of the formula ##STR5## can be used in advantageous manner as perfumes in compositions for perfuming technical and cosmetic products. 
     More particularly, the present invention relates to a perfumery composition consisting essentially of from 1% to 50% by weight of a trimethyl-tetrahydropyran-2-one selected from the group consisting of 
     (1) 4,6,6-trimethyl-tetrahydropyran-2-one of the formula ##STR6## (2) 4,4,6-trimethyl-tetrahydropyran-2-one of the formula ##STR7## and (3) mixtures of (1) and (2), 
     and the remainder customary constituents of perfumery compositions. 
     The production of the compounds, which are known in the literature, is effected with good yields by oxidizing the corresponding trimethyl-cyclopentanones according to Bayer-Villiger by means of a peracid. Peracetic acid is the preferred peracid, but other organic or inorganic peracids can also be used. 4,6,6-Trimethyl-tetrahydropyran-2-one (I) is obtained by using 2,2,4-trimethyl cyclopentanone (Beilstein E III/IV 17, 4227). 4,4,6-Trimethyl-tetrahydropyran-2-one (II) is obtained by using 2,4,4-trimethyl-cyclopentanone (Chem. Ber. 94, 2406 [1961]) as a starting material. For the production of a technical product, a commercial mixture of about 60 parts by weight of 2,2,4-trimethyl-cyclopentanone and about 40 parts by weight of 2,4,4-trimethyl-cyclopentanone, known as trimethyl-cyclopentanone (TMCP-one) can be used. From this mixture, a 60:40 mixture of compounds (I) and (II) results. 
     The trimethyl-tetrahydropyran-2-ones according to the invention are valuable perfumes with a characteristic walnut note. They can be easily combined to novel and interesting odor nuances. Of the two products, 4,6,6-trimethyl-tetrahydropyran-2-one (I) is the more interesting and valuable product, with a mildly bitter typical walnut nuance, while 4,4,6-trimethyl-tetrahydropyran-2-one (II) has a more complex herbaceous nutty-to-methone nuance. The mixture of about 60 parts by weight of (I) and about 40 parts by weight of (II) still has the typical walnut nuance similar to (I). Preferably any mixture should have about 50% or more of 4,6,6-trimethyl-tetrahydropyran-2-one (I). Nothing is found in the known literature about these perfume properties and the possible use of the compounds in perfumes. 
     The trimethyl-tetrahydropyran-2-ones to be used as perfumes according to the invention can be mixed with other perfumes in various quantitative ratios to form new perfumery compositions. In general, the portion of the trimethyl-tetrahydropyran-2-ones to be used in the perfumery compositions according to the invention will vary between 1% and 50% by weight, related to the total perfumery composition. The remainder of the composition are conventional perfumery constituents. 
     Such compositions can be used directly as perfumes or, alternatively, can be used to perfume cosmetics, such as creams, lotions, toilet waters, aerosols, toilet soaps, and technical articles, such as detergents or cleansers, disinfectants and textile preparations. 
     Due to their typical walnut nuance, they are suitable as the sole perfumes in sunlight protecting preparations, such as suntan creams, suntan lotions, and suntan oils. When employed to impart an odor to products, the perfumery compositions are employed in amounts of from 0.05% to 5%, preferably 0.1% to 2% by weight. 
    
    
     The following examples will illustrate the subject of the invention, without limiting it, however, to these examples. 
     EXAMPLES 
     Preparation of 4,4,6-trimethyl-tetrahydropyran-2-one (I) 
     3.84 gm of 2,2,4-trimethyl-cyclopentanone were dissolved in 50 ml of chloroform and cooled in the ice bath. At 0° C., a solution of 0.2 gm of sodium acetate in 11.4 gm of a 40% aqueous peracetic acid was added. The reaction mixture was stirred for 18 hours at room temperature, then neutralized with a sodium hydrogen carbonate solution. The organic phase was separated, dried and concentrated. By distillation, 3.4 gm of 4,6,6-trimethyl-tetrahydropyran-2 -one (I) were recovered with the following characteristics: 
     B.P. 65° C. at 0.1 m bar 
     M.P. 29° to 30° C. 
     n D   30  =1.4470 
     IR (oil) cm -1  : 1730, 1455, 1373, 1275, 1215, 1110, 990, 918, 785 
     
         ______________________________________NMR (CD Cl.sub.3) δ =            1.03 ppm d (6 Hz)                           3 H            1.4  ppm s     3 H            1.42 ppm s     3 H            1.6  ppm m     2 H            2.05 ppm m     1 H            2.6  ppm m     2 H______________________________________ 
    
     The odor nuance was typically walnut, fine mild-bitter. 
     Preparation of 4,4,6-trimethyl-tetrahydropyran-2-one (II) 
     Corresponding to the foregoing preparation, 3.81 gm of 2,4,4-trimethyl-cyclopentanone were reacted to give 3.6 gm of 4,4,6-trimethyl-tetrahydropyran-2-one (II). The compound has the following characteristics: 
     B.P. 65° C. at 0.13 m bar 
     n D   20  =1.4485 
     IR (oil) cm -1  : 1735, 1455, 1385, 1310, 1240, 1178, 1140, 1047, 985, 970, 800. 
     
         ______________________________________NMR (CD Cl.sub.3) δ =            1.05 ppm s     3 H            1.1  ppm s     3 H            1.37 ppm d (6 Hz)                           3 H            1.63 ppm m     2 H            2.3  ppm m     2 H            4.5  ppm m (6 Hz,                           2 Hz) 1H______________________________________ 
    
     The odor was herbaceous with a nutty to menthone nuance, more complex than (I). 
     Preparation of the 60:40 mixture of (I) and (II). 
     By the reaction of 315 gm of a commercial trimethyl cyclopentanone (TMCP-one by VEBA), following the foregoing preparations, 310 gm of a mixture of 4,6,6-trimethyl-tetrahydropyran-2-one (I) and 4,4,6-trimethyl-tetrahydropyran-2-one (II) were obtained in an approximate ratio of 3:2. The mixture has the following characteristics: 
     B.P. 62° C. at 0.47 m bar 
     n D   20  =1.4484 
     The odor nuance was typically walnut, similar to the odor of (I). 
     EXAMPLE 1 
     Perfuming example of a sunlight protecting lotion 
     
         ______________________________________                   Parts by                   Weight______________________________________4,6,6-Trimethyl-tetrahydropyran-2-one                     15Polyoxyethylene sorbitanoleate(Tween 80)                60Isopropyl myristate       20Propylene glycol          20Sunlight protecting agent (Prosolal S8)                     50Distilled water           835______________________________________ 
    
     EXAMPLE 2 
     Perfume composition for odorizing soaps and detergents 
     
         ______________________________________                   Parts by                   Weight______________________________________4,6,6-Trimethyl-tetrahydropyran-2-one                     150p-tert.-Butylcyclohexyl acetate                     80Terpineol                 80Isobornyl acetate         50Benzyl acetate            50Galaxolide                50Lavandin oil              50Ionone                    50Cumarin                   40Benzyl salicylate         40Cinnamic alcohol          30Hydroxycitronellal        30Peti grain oil            30Ylang-oil                 30Galbanum oil synth.       20Cyclamenaldehyde          20Dihydromyrcenol           20Anisaldehyde              20Diethyl phthalate         160______________________________________ 
    
     Instead of the 4,6,6-trimethyl-tetrahydropyran-2-one in the foregoing examples, a 60:40 mixture of 4,6,6-and 4,4,6-trimethyl-tetrahydropyran-2-one can also be used with equally good results. 
     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.