2,3-Dichloro-7-hydroxy-1H-inden-1-one derivatives of the formula I ##STR1## wherein R.sub.1 is hydrogen or one of the groups ##STR2## R.sub.2 and R.sub.3 independently of one another are each hydrogen, fluorine, chlorine, bromine, C.sub.1 -C.sub.4 -alkyl, trifluoromethyl or nitro, R.sub.4 is hydrogen, C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.4 -alkenyl, each of which is unsubstituted or substituted by halogen, or R.sub.4 is phenyl which is unsubstituted or is substituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogen, trifluoromethyl, cyano or nitro, or it is a C.sub.3 -C.sub.6 -cycloalkyl group, and R.sub.5 is C.sub.1 -C.sub.6 -alkyl, C.sub.3 -C.sub.6 -cycloalkyl or C.sub.2 -C.sub.4 -alkenyl. These compounds exhibit a microbicidal action against in particular phytopathogenic fungi and bacteria.
2,3-二
氯-7-羟基-1H-
茚-1-酮的衍
生物的
化学式为I,其中R.sub.1是氢或以下基团之一,R.sub.2和R.sub.3彼此独立地分别是氢、
氟、
氯、
溴、C.sub.1-C.sub.4-烷基、三
氟甲基或硝基,R.sub.4是氢、C.sub.1-C.sub.6-烷基或C.sub.2-C.sub.4-烯基,每个基团未取代或被卤素取代,或R.sub.4是苯基,未取代或被C.sub.1-C.sub.4-烷基、C.sub.1-C.sub.4-烷氧基、卤素、三
氟甲基、
氰基或硝基取代,或者是C.sub.3-C.sub.6-环烷基基团,R.sub.5是C.sub.1-C.sub.6-烷基、C.sub.3-C.sub.6-环烷基或C.sub.2-C.sub.4-烯基。这些化合物对特定的植物病原真菌和细菌具有杀菌作用。