Preparation of acylcyclohexadionethiocarboxylic S-esters

US5130453A · kind A · utility

Assignee

• BASF SE

Inventors

• Juergen Kast · Haßloch, DE
• Juergen Schubert · Meckenheim, DE
• Reinhard Kaczmarek · Worms, DE

Key dates

• Filing date: Oct 3, 1990
• Grant date: Jul 14, 1992
• Expiry date: Oct 3, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C327/28
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An acylcyclohexadionethiocarboxylic S-ester of the fomrula ##STR1## where R.sup.1 and R.sup.2 are substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, benzyl or phenyl, and R.sup.2 is additionally hydrogen, are prepared by reacting an acylcyclohexadione II ##STR2## with hydroxylamine or hydroxylamine-O-sulfonic acid in an inert solvent at from 0.degree. to 150.degree. C., to give an acylcyclohexadione compound III ##STR3## and then reacting the compound III with a mercaptan IV EQU R.sup.2 --SH IV in the presence of an anhydrous acid HX to give an acylcyclohexadionethiocarboximidic S-ester salt V ##STR4## where X is the anion of the acid, and hydrolyzing the compounds V to the acylcyclohexadionethiocarboxylic S-ester I.