Processes for synthesizing novel phosphonate diester compounds of the general formula ##STR1## are disclosed and claimed. The claimed process includes forming a reaction mixture of a C-14 aldehyde and a methylene-bis-phosphonic acid ester, separating a pentadienyl phosphonic acid dialkyl ester intermediate from the reaction mixture, optionally isomerizing the intermediate in the presence of a basic catalyst, and isolating the desired pentadienylphosphonic acid dialkyl ester compound. The isolated phosphonate compounds made according to the processes of the present invention may be employed in synthesizing retinoids such as retinoic acid or carotenoids such as beta-carotene.
公开和声明了一种合成通式为##STR1##的新型
膦酸二酯化合物的过程。所述的过程包括形成C-14醛和甲基
双膦酸酯的反应混合物,从反应混合物中分离出
戊二烯基
膦酸双烷基酯中间体,可选择在碱性催化剂的存在下异构化中间体,并分离所需的
戊二烯基
膦酸双烷基酯化合物。根据本发明的方法制备的分离的
膦酸化合物可用于合成
维甲酸或
β-胡萝卜素等类
视黄醇。