申请人:Bayer Aktiengesellschaft
公开号:US04215050A1
公开(公告)日:1980-07-29
Halogenovinyl-.gamma.-butyralactones, used as intermediates in the preparation of insecticidally active cyclopropanecarboxylic acid esters, and of the formula ##STR1## in which Hal represents F, Cl or Br, X represents H, F, Cl or Br and R.sup.1 and R.sup.2, which may be identical or different, each represents C.sub.1-4 -alkyl or R.sup.1 and R.sup.2, together with the adjacent C atom, form a cycloaliphatic ring with up to 7 C atoms, are produced by basic de-acetylation of the novel corresponding .alpha.-acetyl compounds. Syntheses are given for preparing the acetyl compounds, including novel intermediates of the formulas ##STR2##
卤代乙烯基-γ-丁内酯,用作制备杀虫活性的环丙烷羧酸酯的中间体,其化学式为##STR1## 其中Hal代表F,Cl或Br,X代表H,F,Cl或Br,R.sup.1和R.sup.2可能相同或不同,每个代表C.sub.1-4-烷基或R.sup.1和R.sup.2与相邻的碳原子形成具有最多7个碳原子的环脂肪环。该化合物由新的相应的α-乙酰化合物的碱性脱乙酰制备而成。给出了制备乙酰化合物的合成方法,包括化合物的新中间体的化学式##STR2##