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Herbicidal substituted benzofurans and benzopyrans

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TLDR
Herbicidal N-(heterocyclyl)-substitued benzofurans and benzopyrans of the formulae: the symbols have meanings described in the specification as discussed by the authors.
Abstract
Herbicidal N-(heterocyclyl)-substitued benzofurans and benzopyrans of the formulae: wherein the symbols have meanings described in the specification.

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Fused-benzene derivatives useful as herbicides

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Novel heterocyclic substituted benzenes, herbicidal compositions containing them and the use thereof for combating weeds

TL;DR: In this paper, the selective herbicides of the formula below are disclosed as selective weedicides: where W is a substituted heterocyclic selected from: O or S: halo is chloro, bromo or fluoro; R 1 and R 2 are the same or different radicals seiectea from hydrogen or (C 1 -C 4 ) alkyl; X is hydrogen or halo: X 1 is methylene.
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