3,1 Benzoxazine 2,4-dione

Details 3,1 Benzoxazine 2,4-dione 3,1 Benzoxazine 2,4-dione

1981-10-23

1983-01-18

Ramsuer, Robert W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

C07D26526

Patent

active

043693164

ABSTRACT:
Preparation of a compound of the following formula (I): ##STR1## wherein R.sup.1 is alkyl of 1 to 12 carbons, from the compound of the following formula (II): ##STR2## by the steps of coupling (II) with 3,4-dichlorobenzotrifluoride; reacting the --NH.sub.2 and COOH groups with a COX.sub.2 compound, X being a leaving group, to produce a heterocycle; opening the heterocycle with an alkanesulphonamide; and oxidizing the resultant --NH.sub.2 group to an --NO.sub.2 to yield a compound of formula (I). Novel intermediates are also described. Compounds of formula (I) are useful as selective pre- and post-emergent herbicides.

REFERENCES:
patent: 3513156 (1970-05-01), Speakman
patent: 4306074 (1981-12-01), Tonne et al.

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