Process for the preparation of herbicidally active phenyl carbam

Details Process for the preparation of herbicidally active phenyl carbam Process for the preparation of herbicidally active phenyl carbam

1984-09-20

1988-05-31

Evans, J. E.

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

Organic compounds

Carboxylic acid esters

71111, 560 24, 560 27, 560 29, C07C125073, C07C125075, A01N 3300

Patent

active

047482656

ABSTRACT:
Herbicidally active substituted phenyl carbamates I ##STR1## in which R.sup.1 represents a C.sub.1 -C.sub.6 alkyl group, a C.sub.3 -C.sub.6 cycloalkyl group or an aryl group, which aryl group may be substituted by a halogen atom and/or a C.sub.1 -C.sub.6 alkyl group and/or a trifluoromethyl group, and R.sup.2 represents a C.sub.1 -C.sub.6 alkyl, C.sub.2 -C.sub.6 alkenyl or C.sub.2 -C.sub.6 alkynyl group that may be substituted by a terminal halogen atom, are prepared by reacting N-hydroxyphenyl carbamates II ##STR2## with either isocyanates R.sup.1 --N.dbd.C.dbd.O or amino chlorides R.sup.1 --NH--COCl in an aqueous medium thus avoiding the use of organic solvents. The end product I may be extracted from the aqueous slurry into a water-immiscible solvent.
The N-hydroxyphenyl carbamates II can be prepared by reacting 3-aminophenol with chloroformates in an aqueous medium, and the resulting product may be reacted in situ, without isolation, with isocyanates, in the same reaction vessel. Stabilized herbicidal compositions containing compounds I may be prepared by suspending the compounds I in a liquid phase comprising one or more oily components and one or more surfactants.

REFERENCES:
patent: 2651658 (1953-09-01), Bohl
patent: 3404975 (1968-10-01), Wilson et al.
patent: 3450745 (1969-06-01), Payne et al.
patent: 3535101 (1970-10-01), Boroschewski et al.
patent: 3551477 (1970-12-01), Koenig et al.
patent: 3671571 (1972-06-01), Koenig et al.
patent: 3692820 (1972-09-01), Boroschowski et al.
patent: 3836570 (1974-09-01), Szabo
patent: 4131751 (1978-12-01), Koenig et al.
patent: 4252557 (1981-02-01), Boroschewski et al.
Degering, An Outline of Organic Nitrogen Compounds, (1950) 551.
Migrdichian, Organic Synthesis, (1957) 399.

Affiliated with

Also associated with

Rating

Process for the preparation of herbicidally active phenyl carbam does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of herbicidally active phenyl carbam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of herbicidally active phenyl carbam will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1875401