Method of preparing aryl triazolinones with trialkyl orthoacetat

Details Method of preparing aryl triazolinones with trialkyl orthoacetat Method of preparing aryl triazolinones with trialkyl orthoacetat

1995-04-04

1996-08-06

Raymond, Richard L.

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

Organic compounds

Imidate esters

C07C24322

Patent

active

055435416

ABSTRACT:
A method for preparing an alkoxyethylidene-substituted aryl hydrazine having the formula ##STR1## and thereafter cyclizing the same with a cyanate salt under mildly acidic conditions in the presence of an organic solvent, optionally in the presence of a cyclization-aiding amount of water, to form an aryl triazolinone of the formula ##STR2## wherein X is independently hydrogen, halogen, lower alkyl, lower alkoxy, nitro, hydroxy, --NHSO.sub.2 R.sup.1, --NR.sup.1 SO.sub.2 R.sup.1, or --N(SO.sub.2 R.sup.1).sub.2, where R.sup.1 is lower alkyl; R is lower alkyl, and each R is the same; and n is an integer of from 1-3, which triazolinones am useful as intermediates for preparing herbicides.

REFERENCES:
patent: 4818275 (1989-04-01), Theodoridis
patent: 4980480 (1990-12-01), Theodoridis
patent: 5125958 (1991-06-01), Poaa
patent: 5256793 (1993-10-01), Bailey et al.
Comptes Rendes (1978), 287(3), 69-72.

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