申请人:BASF Aktiengesellschaft
公开号:US04324725A1
公开(公告)日:1982-04-13
Preparation of 5-(2,2-dihalovinyl)-4,4-dialkyl-tetrahydro-furan-2-ones of the formula I ##STR1## where R.sup.1 and R.sup.2 are each alkyl of 1 to 4 carbon atoms and X is halogen, by reacting a carboxylic acid amide of the formula II ##STR2## where R.sup.3 and R.sup.4 are each alkyl of 1 to 4 carbon atoms, aralkyl of 7 to 9 carbon atoms or aryl of 6 to 10 carbon atoms, or together with the nitrogen form a 5-membered or 6-membered saturated ring which may contain a second hetero-atom, with a carbon tetrahalide of the formula III CX.sub.4 (III) to give an iminium salt of the formula IV ##STR3## and then hydrolyzing the iminium salt; and novel iminium salts of the formula IV.
通过将式II的羧酸酰胺与式III的四卤化碳反应,得到式I的5-(2,2-二卤乙烯基)-4,4-二烷基-四氢呋喃-2-酮(其中R1和R2均为1至4个碳原子的烷基,X为卤素),然后水解亚胺盐,其中式II的R3和R4均为1至4个碳原子的烷基、7至9个碳原子的芳基烷基或6至10个碳原子的芳基,或与氮原子一起形成可能含有第二个杂原子的5元或6元饱和环。同时,还提供了式IV的新型亚胺盐。