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US 3,962,307 AGranted
Cyanobenzeneacetonitriles
AssigneeE. I. Du Pont de Nemours and Company
InventorElmore Louis Martin
Life of this patent
Estimating the term…
Abstract
Certain substituted cyanobenzeneacetonitriles, and their halobenzyl halide intemediates are effective preemergence and postemergence herbicides, which control undesired vegetation without injury to crops.
Claims4
A compound having the formula ##SPC6##
- wherein
- A and B are different, one being a Z group and the other being a CR.sub.5 R.sub.6 Z radical;
- wherein R.sub.5 and R.sub.6 are each independently hydrogen or methyl, and Z is the cyano group;
- and
- each of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 independently is hydrogen, a C.sub.1 -C.sub.7 alkyl, a halogen, or the nitro group;
- provided that:
- a. at most two of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are nitro groups;
- b. at most two of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are halogens;
- c. at least one of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 is hydrogen or halogen;
- d. at least one of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 is a C.sub.2 -C.sub.7 alkyl;
- e. no nitro groups are ortho to each other;
- f. no alkyl groups are ortho to each other;
- g. each alkyl group has at most three carbon atoms in a straight chain from the point of attachment to the aromatic ring.
10 more elements
Dependencies are inferred from the claim text.