A silyl-enol ether of the formula ##STR1## wherein n stands for the number and X stands for a group ##STR2## or n stands for the number 1 and X stands for the 6,11-dimethylhexadeca-2,4,6,8,10,12,14-heptaene-2,15-diyl group, the symbols R.sup.1 have the same or different significances and denote alkyl groups, and the symbol R.sup.2 represents a trialkylsiloxy group --OSi(R.sup.1).sub.3 or an ether group, is oxidized with percarboxylic acid and, if desired, the resulting .alpha.-siloxy ketone is hydrolyzed to an .alpha.-hydroxy ketone. This process is especially suitable for the manufacture of astaxanthin.
一种化合物的
化学式为##STR1##,其中n代表数字,X代表基团##STR2##或n代表数字1,X代表6,11-二甲基
十六烯-2,4,6,8,10,12,14-庚二烯-2,15-二基基团,符号R.sup.1具有相同或不同的含义,表示烷基基团,符号R.sup.2代表三烷基
硅氧基--OSi(R.sup.1).sub.3或醚基团,通过过氧
羧酸氧化,如果需要,可将产生的α-
硅氧基酮
水解为α-羟基酮。该过程特别适用于制造
虾青素。