Compounds of the formula: ##STR1## wherein R.sup.1 is a 2,6,6-trimethyl-1-cyclohexen-1-yl or 2,3,6-trimethylphenyl group, either of which may be unsubstituted or substituted by a hydroxy group or a protected hydroxy group, R.sup.2 is aryl, and X.sup.- is an anion are manufactured by hydrogenating a compound of the formula: ##STR2## wherein R.sup.1, R.sup.2 and X.crclbar. are as above, in an organic solvent or aqueous-organic solvent in the presence of a nickel-, palladium-, platinum-, cobalt-, rhodium-, iridium-, or ruthenium-containing catalyst. The process is suitable as an intermediate step in carotenoid and retinoid syntheses.
化合物的公式:## STR1 ##其中R.sup.1是2,6,6-三甲基-1-
环己烯-1-基或2,3,6-三甲基苯基基团,两者均可为未取代或取代羟基或保护羟基,R.sup.2为芳基,X.sup.-为阴离子,通过在有机溶剂或
水-有机溶剂中,在含有
镍、
钯、
铂、
钴、
铑、
铱或
钌的催化剂存在下,氢化公式的化合物制造而成:## STR2 ##其中R.sup.1,R.sup.2和X.crclbar.如上所述。该过程适用于类
胡萝卜素和
视黄醇合成的中间步骤。