Cyclobutanecarboxylic acid imides of the formula I ##STR1## wherein one of R.sub.1 and R.sub.6 is hydrogen, methyl or ethyl, and the other is methyl or ethyl, R.sub.2 and R.sub.3 independently of one another are each hydrogen, fluorine or methyl, or R.sub.2 is acetoxy or chlorine while R.sub.3 is hydrogen, and wherein R.sub.4 is hydrogen, methyl or chlorine, and R.sub.5 is hydrogen or methyl, whereby R.sub.3 and R.sub.4 together can also form an additional bond in the four-membered ring, are suitable for combating various fungi and have a particularly excellent action against Botrytis. They can be produced in an especially advantageous manner by photochemical [2+2] cycloaddition of alkenes or alkines with for example appropriately substituted maleic acid-(3,5-dichlorophenyl)-imides.
公式I中的
环丁基羧酸亚胺
其中R.sub.1和R.sub.6中的一个是氢,甲基或乙基,另一个是甲基或乙基,R.sub.2和R.sub.3相互独立地是氢,
氟或甲基,或者R.sub.2是乙酰氧或
氯,而R.sub.3是氢,其中R.sub.4是氢,甲基或
氯,R.sub.5是氢或甲基,因此R.sub.3和R.sub.4也可以在四元环中形成额外的键。它们适用于对抗各种真菌,对灰霉菌的作用特别出色。它们可以通过烯烃或
炔烃与适当取代的
马来酸-(3,5-二
氯苯基)-
亚胺的光
化学[2+2]环加成特别有利地生产。