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-壬
三烯衍
生物,其中R.sub.1和R.sub.2与它们连接的碳原子一起形成一个羰基,或者R.sub.1和R.sub.2中的每一个表示烷氧基,或者R.sub.1和R.sub.2一起形成一个烷二氧基基团,可以通过以下反应制备:##STR2##式的
丁二烯衍
生物,其中R为烷基或苯基,与10式的
戊醛酮
缩醛反应,然后将产物与卤代甲基
三苯基膦盐酸盐反应,这些是有用的中间体,例如用于生产叶酸。