Hoechst Aktiengesellschaft

Heinz Boesenberg

Hermann Bieringer

Klaus Bauer

Hilmar Mildenberger

Peter Langeluddeke

Gerhard Horlein

Helmut Kocher

Sigurd Rosinger

Adolf Gaube

Compounds of the formula ##STR1## in which X denotes O or S; R and R.sup.1 denote H, halogen, alkyl, alkoxy, CN, NO.sub.2 or CF.sub.3 ; R.sup.2 denotes H or alkyl; Y denotes an optionally substituted alkylene or phenylene group and Z denotes a carboxyl, carboxylate, carboxylic acid ester, carboxamide, nitrile or thioamide group, are suitable for reducing the phytotoxicity of herbicides in useful plants.

Benzoxazolyl- and benzothiazolyl-amino acids, their preparation and

Compounds of the formula ##STR1## in which R represents hydroxyl, (C.sub.1 -C.sub.10)alkoxy, (C.sub.1 -C.sub.6)alkylthio, (C.sub.2 -C.sub.4)alkenyloxy, cyclohexyloxy, cyclopentyloxy, phenoxy or phenylthio both optionally substituted once or twice with halogen, benzyloxy, benzylthio or -O-cat in which 'cat' stands for the cation of an inorganic or organic base, have a very good effect on wild oat, barnyard grass, bristle grass and rayegrass in a much lower concentration than known analogous compounds.

Herbicidal compounds

Polychlorcyclopentane and hexachlorcyclopentadiene are prepared by reacting liquid chlorinated cyclopentane with gaseous chlorine in the presence of an electromagnetic radiation and optionally by a subsequent reaction of these higher chlorinated cyclopentanes with chlorine at a temperature of more than 300.degree.C to yield hexachlorcyclopentadiene.

Preparation of polychlorcyclopentane and hexachlorcyclopentadiene

Growing community of inventors

Langenhain, Germany

Heinz Boesenberg