Bayer Aktiengesellschaft

Mobay Chemical Corporation

Hermann Arold

Hans-Ludwig Elbe

Hans-Joachim Diehr

Eckart Kranz

Claus Stolzer

Wolfgang Kramer

Fritz Maurer

Jorg Stetter

Peter Fey

Bernd Gallenkamp

Vidyanatha A Prasad

Joachim Mittendorf

Hans-Christian Militzer

Michael Matzke

Klaus-Helmut Mohrs

Rudolf Thomas

Reimer Colln

Siegbert Humburger

Helmut Porkert

High enantio-selective process for producing pure enantiomeric

A process for the preparation of a 1-aryl-5-amino-pyrazole of the formula ##STR1## in which Ar is in each case optionally substituted phenyl or pyridyl, comprising reacting an arylhydrazine of the formula

Preparation of 1-aryl-5-amino-pyrazoles

The process which comprises ##STR1## in which R represents hydrogen, alkoxy, alkylamino or dialkylamino or represents optionally substituted radicals from the series comprising alkyl, cycloalkyl and aryl,

Process for the preparation of phosphoric acid derivatives and

In the preparation of a phenoxy-azolyl-butanone derivative of the formula ##STR1## in which X is a halogen atom,

Preparation of phenoxy-azolyl-butanone derivatives

A process for the preparation of a dimethyl polysulphide of the formula

Preparation of dimethyl polysulphides

In the reaction of 1-chloro-3,3-dimethylbutan-2-one with a phenol to form an ether-ketone, halogenating it to form a halogenoether-ketone and reacting it with imidazole or 1,2,4-triazole to form a 1-azolyl-3,3-dimethyl-1-phenoxybutan-2-one of the formula ##STR1## in which X is N or CH,

Preparation of 1-azolyl-3,3-dimethyl-1-phenoxy-butan-2-ones

In the preparation of an o-dialkylaminomethylphenol of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is alkyl with 1 to 6 carbon atoms, or R.sup.1 and R.sup.2 conjointly with the adjacent nitrogen atom, form a five-membered or six-membered ring, by reacting phenol, formaldehyde or paraformaldehyde and an amine of the formula ##STR2## the improvement which comprises carrying out the reaction in the presence of an organic liquid which is immiscible with water but which is a solvent for the phenol and amine employed as starting materials and the o-dialkylaminomethylphenol which is formed. Advantageously the amine is dimethylamine or diethylamine, the organic liquid is a member selected from the group consisting of cyclohexane, methylcyclohexane, methylene chloride, chloroform, carbon tetrachloride, ethylene chloride, diethyl ether, dipropyl ether, dibutyl ether, dipentyl ether, methyl butyl ether, ethyl propyl ether, diisopropyl ether and di-isobutyl ether, the reaction is effected at about 10.degree. to 70.degree. C., about 1.1 to 2 moles of phenol, about 1 mole of formaldehyde and about 2.5 to 3.5 moles of the organic liquid, after the reaction the by-product water is separated from the organic liquid containing the o-dialkylaminomethylphenol, the organic liquid is separated from the o-dialkylaminomethylphenol, and the organic liquid is recycled for further reaction.

Preparation of o-dialkylaminomethylphenols

A process for the preparation of a dithiophosphoric acid diester-halide of the formula ##STR1## IN WHICH R.sup.1 is alkyl with 1 to 10 carbon atoms, aralkyl with 1 to 6 carbon atoms in the alkyl radical, or alkoxyalkyl or alkylthioalkyl with 1 to 5 carbon atoms in each alkyl radical,

Preparation of dithiophosphoric acid diester-halides

A process for the preparation of a dithiophosphoric acid diester halide of the formula ##STR1## IN WHICH R.sup.1 and R.sup.2 each independently is alkyl with 1 to 5 carbon atoms, and

Preparation of dithiophosphoric acid diester halides

A process for the preparation of an alkylthiomethylphenol of the formula ##STR1## COMPRISING REACTING A DIALKYLAMINOMETHYLPHENOL OF THE FORMULA ##STR2## WITH A THIOCARBOXYLIC ACID S-ester of the formula ##STR3## in which R.sup.1 is optionally substituted alkyl with 1 to 12 carbon atoms or optionally substituted phenyl, R.sup.2 and R.sup.3 each independently is hydrogen, alkyl with 1 to 5 carbon atoms, halogen or nitro, or together form a benzene ring or cycloalkane ring with 3 to 5 carbon atoms which is fused to the phenyl ring,

Preparation of alkylthiomethylphenols

A process for the preparation of a dithiophosphoric acid ester dihalide of the formula ##STR1## in which X is chlorine, bromine, fluorine or iodine, and

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Wuppertal, Germany

Hermann Arold