1,3,5-Nonatriene derivatives of formula: ##STR1## in which R.sub.1 and R.sub.2, together with the carbon atom to which they are linked, form a carbonyl group, or each of R.sub.1 and R.sub.2 denotes alkoxy or R.sub.1 and R.sub.2 together form an alkylenedioxy radical, which may be made by reaction of a butadiene derivative of formula: ##STR2## in which R is alkyl or phenyl, with a butanal ketoacetal of 10 formula: ##STR3## followed by reaction of the product with a halomethyltriphenylphosphonium halide, are useful intermediates e.g. for the production of phytol.
公式为##STR1##的1,3,5-Nonatriene衍
生物,其中R1和R2与它们连接的碳原子一起形成一个羰基,或者R1和R2中的每一个表示烷氧基,或者R1和R2一起形成一个烷二氧基基团,可以通过下列反应制备:将公式为##STR2##的
丁二烯衍
生物与公式为##STR3##的
戊醛酮
缩醛反应,然后再将产物与卤代甲基
三苯基膦卤化物反应。这些中间体可用于生产类
胡萝卜素醇。