| 摘要 |
The invention relates to new benzazole derivatives of the formula I <IMAGE> (I) wherein X is oxygen or sulphur, R1 is lower alkyl, lower alkenyl or cycloalkyl, R2 and R3 independently of one another are each hydrogen, lower alkyl or cycloalkyl radicals or taken together are a substituted or unsubstituted bivalent hydrocarbon residue of aliphatic character in which the carbon atoms of the chain may be interrupted by a heteroatom, R4 is either a group <IMAGE> wherein R5 and R6 independently of one another are lower alkyl or cycloalkyl radicals, optionally substituted, or taken together R5 and R6 are a substituted or unsubstituted bivalent hydrocarbon residue of aliphatic character in which the carbon atoms of the chain may be interrupted by a heteroatom, or, R4 is a group <IMAGE> where R7 is a lower alkyl group, and their salts and N-oxides. The products are useful as anthelmintic effective agents. The products can be prepared to methods known per se.
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