Oxadiazole benzoic acid derivatives as herbicides

Details Oxadiazole benzoic acid derivatives as herbicides Oxadiazole benzoic acid derivatives as herbicides

1975-02-05

1976-06-22

Gotts, Lewis

Chemistry: fertilizers

Processes and products

Forms or conditioning

A01N 922

Patent

active

039648966

ABSTRACT:
New 2-(1,3,4-oxadiazole-2-yl) benzoic acids and salts and esters thereof, as well as certain 2-(2-oxazolyl) benzoic acids, salts and esters, having the formula: ##SPC1##
Where X is nitrogen or C-R" (R" being hydrogen or methyl), R is phenyl or various substituents, and R' and the Y's are hydrogen or various substituents, are effective preemergence or postemergence herbicides, on various crops. The chemicals act selectively and are useful against purple nutsedge and in cranberry. Oxadiazoles of the invention may be made by reacting a benzhydrazide with phthalic anhydride to form a hydrazide which is cyclized by removal of the elements of water, using as a catalyst fuming sulfuric acid or dimethylformamide-sulfur trioxide complex.

REFERENCES:
patent: 3128171 (1964-04-01), Tischler
patent: 3130205 (1964-04-01), Richter
patent: 3130206 (1964-04-01), Richter
patent: 3808223 (1974-04-01), Dahle et al.

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