Novel 3-formyl-4-methyl-pentanoic acid derivatives of the formula ##STR1## wherein Y is an aromatic group, R.sub.2 and R.sub.3 are individually alkyl of 1 to 4 carbon atoms or taken together with the carbon atom to which they are attached form a carbon homocycle of 3 to 6 carbon atoms, the Rs are alkyl of 1 to 6 carbon atoms or together form a polymethylene of 2 to 3 carbon atoms and Z' is selected from the group consisting of --COOH and Z and Z is selected from the group consisting of cyano and --COOR.sub.1 wherein R.sub.1 is alkyl of 1 to 6 carbon atoms and their preparation which are useful for the preparation of 3-formyl-4-R.sub.2 R.sub.3 -but-3-ene-1-oic acid which is an intermediate for the preparation of a compound of the formula ##STR2## wherein R.sub.4 is hydrogen or the remainder of an alcohol of the formula R.sub.1 OH by the process of copending, commonly assigned U.S. patent application Ser. No. 153,338 filed May 27, 1980.
该文中介绍了一种化合物的衍
生物,化合物的分子式为 ##STR1## 其中Y是芳香基团,R.sub.2和R.sub.3分别是1到4个碳原子的烷基,或者与它们附着的碳原子一起形成3到6个碳原子的碳同源环;Rs是1到6个碳原子的烷基,或者一起形成2到3个碳原子的多亚甲基;Z'从--COOH和Z的组中选择,Z从
氰基和--COOR.sub.1的组中选择,其中R.sub.1是1到6个碳原子的烷基。这些衍
生物的制备对于制备3-甲酰基-4-R.sub.2 R.sub.3-丁-3-烯-1-酸是有用的,这是一种制备化合物的中间体,该化合物的分子式为 ##STR2## 其中R.sub.4是氢或公式R.sub.1 OH的醇余部分。这种衍
生物的制备是通过与共同分配的美国专利申请Ser. No. 153,338于1980年5月27日提交的过程来实现的。