Hoechst Aktiengesellschaft

Manfred Koch

Hilmar Mildenberger

Reinhard Handte

Peter Langeluddeke

Gerhard Horlein

Hermann Bieringer

Peter Herbrechtsmeier

Burkhard Sachse

Thomas Maier

Hans J Nestler

Gerhard Stahler

Helmut Kocher

Heinrich Leditschke

Process for the preparation of (phenoxy- or benzyl-)-phenoxypropionic acids and the alkali metal salts thereof by adding a double molar amount of an aqueous alkali hydroxide to a boiling mixture of a (benzyl- or phenoxy-)-phenol and 2-chloropropionic acid (ester), with simultaneous azeotropic distillation of the water introduced or formed in the reaction.

Process for the preparation of (phenoxy- or benzyl-)-phenoxypropionic

The invention relates to a process for the preparation of highly pure carbendazim ##STR1## which starts from o-phenylenediamine and methyl cyanocarbamate, and, in addition, a reducing agent is added.

Process for reducing the proportions of by products in the preparation

Manufacture of 3-hydroxy-1,2,4-triazoles by cyclization of corresponding semicarbazides by formic acid in the presence of an inorganic acid or halide thereof.

Process for the manufacture of substituted 3-hydroxy-1,2,4-triazoles

What is disclosed is a process for the preparation of optically active 2-chloropropionic acid esters by the decomposition of optically active 2-chlorosulfinoxypropionic acid esters in the presence of quaternary ammonium or phosphonium salts as catalysts.

Process for the preparation of optically active 2-chloropropionic acid

The present invention relates to new thioglycolic acid anilides of the formula I ##STR1## R.sup.1 denotes (C.sub.1 -C.sub.4)alkyl, halogen, (C.sub.1 -C.sub.3)alkylthio, (C.sub.1 -C.sub.4)alkoxy or (C.sub.3 -C.sub.4)alkenyl,

Fungicidal thioglycolic acid anilides, processes for their manufacture

Process for the preparation of (phenoxy- or benzyl-)-phenoxypropionic acids by simultaneous addition of 2-chloropropionic acid (ester) and the double molar amount of an aqueous alkali hydroxide to a solution of a phenoxyphenol or benzylphenol in a solvent forming an azeotropic mixture with water, while continuously distilling off the water formed or introduced.

Process for the preparation of phenoxypropionic acids and their alkali

(Phenoxy- or benzyl)-phenoxypropionic acid methyl esters are produced by esterification of the corresponding anhydrous alkali metal salts with half the molar amount of dimethyl sulfate at a temperature exceeding 120.degree. C.

Process for the manufacture of (phenoxy or benzyl)-phenoxypropionic acid

Phenoxyphenoxy-propionic acid derivatives of the formula ##STR1## exhibit an outstanding herbicidal activity against a wide variety of weed grasses and are well tolerated by dicotyledonous crop plants and various cereals.

Phenoxyphenoxy-propionic acid derivatives

Phenoxy-phenoxypropionic acid derivatives of the formula ##STR1## wherein R is hydrogen or halogen, and R.sub.1 is substituted alkyl, cyclohexenyl, phenylalkenyl or (substituted) alkinyl, are interesting selective herbicides having a special activity against weed grasses. They are obtained for example by reaction of corresponding phenoxypropionic acid halides with hydroxy compounds of the formula HO--R.sub.1.

Growing community of inventors

Eppstein, Germany

Manfred Koch