Process for the preparation of hydroxycarboxanilides
申请人:Hoechst AG
公开号:US05631403A1
公开(公告)日:1997-05-20
The present invention relates to a process for the preparation of hydroxycarboxanilides of the formula (1) ##STR1## in which R.sup.1 and R.sup.2 are identical or different and are hydrogen, halogen, a nitro group, a cyano group, a straight-chain or branched alkyl, alkenyl, alkynyl or alkoxy group having 1 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, a cycloalkyl group having 6 to 12 carbon atoms or an aryl group having 6 to 12 carbon atoms, R.sup.3 is hydrogen or a straight-chain or branched alkyl group having 1 to 12 carbon atoms and n is an integer from 1 to 12, by reacting a halocarboxanilide of the formula (2) ##STR2## in which R.sup.1, R.sup.2, R.sup.3 and n have the same meaning as in formula (1) and Hal is chlorine, bromine or iodine, with a basic compound in a solvent mixture comprising water and one or more polar aprotic solvents at a temperature of 40.degree. to 180.degree. C.
A class of compounds having the structural formula ##STR1## in which Ar is substituted phenyl and R is methyl or ethyl possesses improved activity as pre-emergent herbicides and insecticides.
A process for the preparation of glycoloylanilide of the formula (G) ##STR1## is recited that involves reacting a nitrobenzene with hydrogen and, if desired, with a carbonyl compound, in the presence of a noble metal catalyst and a solvent, reacting the compound produced with chloroacetyl chloride, reacting the resulting product with a benzyl alcohol and with a base, or reacting the resulting compound with an O-benzylglycoloyl chloride, and debenzylating the resulting benzylglycoloylanilide product by reacting with hydrogen in the presence of a noble metal catalyst. The invention also relates to a process for the preparation of O-benzylglycoloylanilide.