Hydrogenation of Alcohols Hydrogenation of aldehydes
having the structure shown in Fig. 2, by hydrogenating the compound having structure
given in Fig. 3, in the presence of copper chromite catalyst. Such mixtures are used in augmenting or
enhancing the aroma of perfume compositions, colognes and perfumed articles including fabric
softener compositions, cosmetic powders and solid or
liquid anionic,
cationic, non ionic
and zwitteronic detergents.
Giersch and Ohloff [84] discovered the bicyclic alcohol of formula as shown in the Fig. 4. The
alcohol possesses a natural woody odour with an ambary character. The woody note is reminiscent
in particular of cedar wood without however possessing the “sawdust” character of latter. The
ambary note, on the other hand, is reminiscent of certain aspects presented by precious materials
such as grey amber. Owing to their odour properties, the alcohols find an utilisation of wide
scope, both in alcoholic perfumery and in technical applications such as, in the perfuming of soaps,
powder or liquid detergents, fabric softeners, household materials, cosmetics, shampoos, beauty
creams, body deodorizers or air fresheners.
A process for the preparation of bicyclic aliphatic alcohols comprises the following reaction
steps shown in Fig. 5 [84]: a the addition of ethyl methacrylate to mycrene
under the conditions of a Diels Alder type reaction and the treatment of the resulting
reaction mixture with an acidic cyclization catalyst;
b the reduction of the obtained ester by Ni CuCr
2
O4 hydrogenation, and c the reduction of the resulting by means of a
usual reduction reagent of the ester formation.