申请人:Imperial Chemical Industries PLC
公开号:US04898997A1
公开(公告)日:1990-02-06
These compounds have the general formula: ##STR1## wherein R and R.sup.1, which may be the same or different, are hydrogen or alkyl, preferably C.sub.1 -C.sub.4 alkyl, and X, Y and Z are each independently hydrogen, chlorine or fluorine, provided that when R, R.sup.1 and Z are hydrogen, X and Y are not both hydrogen or both fluorine, and are prepared by dehydrating an alcohol of the formula: ##STR2## by, for example, heating the alcohol in the presence of a catalytic amount of a strong acid such as p-toluenesulphonic acid and preferably in the presence of an inert solvent. The compounds are intermediate for the preparation of fungicidal compounds.
这些化合物的通式为:##STR1## 其中R和R.sup.1,可以相同也可以不同,是氢或烷基,优选为C.sub.1-C.sub.4烷基,而X,Y和Z则各自独立地是氢,氯或氟,但当R,R.sup.1和Z为氢时,X和Y不能同时为氢或氟。这些化合物是通过脱水制备而成,脱水的醇的式子为:##STR2## 例如,在强酸(如对甲苯磺酸)的催化下,最好在惰性溶剂的存在下加热醇来制备这些化合物。这些化合物是制备杀真菌化合物的中间体。