申请人:Rhone-Poulenc Nutrition Animale
公开号:US05567852A1
公开(公告)日:1996-10-22
The present invention relates to novel intermediates for the preparation of vitamin A and carotenoids corresponding to the formula (II): ##STR1## in which A represents a hydrogen or an alkyl, alkenyl or alkoxy group containing 1 to 4 carbon atoms, and X represents a carbon atom, and to a process for their preparation and their use, and further relates to compounds for preparing intermediates of formula (II) corresponding to the formula (III): ##STR2## in which R represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkylcarbonyl, alkenylcarbonyl, alkoxyalkyl or alkoxyalkenyl group in which the alkyl groups have 1 to 10 carbon atoms and the alkenyl groups have 2 to 10 carbon atoms, each of said groups being linear or branched and each being substituted or unsubstituted.
本发明涉及一种用于制备维生素A和对应于公式(II)的类胡萝卜素的新型中间体:##STR1##
其中A代表氢或含有1至4个碳原子的烷基、烯基或烷氧基,X代表碳原子,以及它们的制备方法和用途,进一步涉及用于制备公式(II)的中间体的化合物,对应于公式(III):##STR2##
其中R代表氢原子、具有1至10个碳原子的烷基、具有2至10个碳原子的烯基、烷基羰基、烯基羰基、烷氧基烷基或烷氧基烯基,其中烷基具有1至10个碳原子,烯基具有2至10个碳原子,每个基都是线性或支链的,且每个基都是取代或未取代的。