To study the oxidative degradation of p-carotene to vitamin A in the animal body, a number of possible intermediates have been prepared. Starting with 15,15′-dehydro-β-apo-12′-carotenal(C25) vinylogous series of polyene aldehydes and acetates with 25 to 40 carbon atoms have been synthesized by successive enol ether condensations. The synthetic β-apo-8′-carotenal(C30) and β-apo-8′-carotenal(C30) were
为了研究对
胡萝卜素在动物体内氧化降解为
维生素A的方法,已制备了许多可能的中间体。首先,通过连续的烯醇醚缩合反应合成了15,15'-脱氢-β-apo-12'-
胡萝卜素(C 25)
乙烯基系列多烯醛和具有25至40个碳原子的
乙酸酯。合成的β-apo-8'-
胡萝卜素(C 30)和β-apo-8'-
胡萝卜素(C 30)与
β-胡萝卜素的
高锰酸盐氧化产物及其相应的醇(通过KARRER分离)相同。