| abstract |
A process for the preparation of trans-decahydronaphthalene compounds of Formula I ##STR1## wherein X is lower alkyl, --(CH 2 ) 3 --Z--R 2 , ##STR2## --(CH 2 ) 3 COOR 4 , or --(CH 2 ) 3 CN; Y and Z are ketalized carbonyl or free, esterified, or etherified hydroxymethylene; n U is halogen; n R 1 , r 2 , and R 3 are lower alkyl; and n R 4 is alkyl; n Wherein an octahydronaphthalene compound of Formula II ##STR3## is converted, in the presence of bases, by reaction of a trialkyl chlorosilane of the formula n n (R.sub.5).sub.3 Si--Cl n n wherein the R 5 each are lower alkyl group, to a hexahydronaphthalene compound of the formula ##STR4## The hexahydronaphthalene compound is hydrogenated, in an inert solvent with hydrogen in the presence of a platinum-, palladium-, or rhodium-containing hydrogenation catalyst, to an octahydronaphthalene compound of the formula ##STR5## and a vinyl ketone of the formula n n XCOCH═CH.sub.2 n n is added to the thus-obtained octahydronaphthalene compound in an inert solvent in the presence of a Lewis acid. |