Bayer Aktiengesellschaft

Gebhard Rauleder

Helmut Waldmann

Volker Mues

Wolfgang Behrenz

Ludwig Bottenbruch

Hans-Joachim Traenckner

Wolf Reiser

Hermann Seifert

Peter Feyen

Gerhard Scharfe

Wolfgang Gau

Rupert Wenzel

The known E-isomers of compounds of the formula ##STR1## in which X and Y independently of each other represent hydrogen or halogen, are obtained according to a new process, in which triazolylketones of the formula ##STR2## in which X and Y have the above mentioned meaning, are reacted with an excess of cyclohexanecarbaldehyde in the presence of a non-polar organic diluent and in the presence of a catalyst mixture of organic acids and secondary amines in a molar ratio of 1:0.5 to 1:1 at temperatures between 40.degree. and 100.degree. C. by continuously removing the water formed and subsequently working up in the manner that is described in the specification.

Process for the preparation of 3-isomers of

Polyglycidyl compounds are prepared by reacting certain polyallyl compounds with a percarboxylic acid containing 3 or 4 C atoms, subsequently removing, by distillation, the carboxylic acid formed from the percarboxylic acid, then separating the remaining mixture by simultaneous extraction with a lipophilic and a hydrophilic phase, subsequently working up the laden lipophilic phase and the laden hydrophilic phase separately in a manner which is known per se, and obtaining the polyglycidyl compound as the residue from working up of the laden hydrophilic phase.

Process for the preparation and isolation of polyglycidyl compounds

Pinacolone is prepared by adding 2,3-dimethyl-2-butene and an aqueous solution of hydrogen peroxide at a temperature of 20.degree. to 90.degree. C. to a solution which contains water and one or more carboxylic acids having 1 to 8 C atoms and which can, if desired, also contain small amounts of a strong acid, increasing the temperature after substantial or complete reaction of the hydrogen peroxide, and distilling off as an azeotropic mixture with water the pinacolone formed.

Process for preparing pinacolone

2,2-Dicyclohexenylpropane is prepared by heating 4,4'-dioxydicyclohexylpropane in the presence of a strong acid, under pressures from 1 to 50 mbar and at 120.degree. to 220.degree. C., distilling off the 2,2-dicyclohexenylpropane produced with the water formed and separating the water out of the top product from the distillation.

Process for the preparation of 2,2-dicyclohexenylpropane

The invention relates to a process for the provision of 5-(oxiranylmethyl)-1,3-benzodioxole by reaction of 5-(2-propenyl)1,3-benzodioxole with a percarboxylic acid having 1 to 8 carbon atoms in an inert organic solvent.

Process for the preparation of 5-(oxiranylmethyl)-1,3-benzodioxole

5-(3,4-Methylenedioxybenzyl)-dioxolanes of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is H, alkyl, alkenyl, alkynyl and aryl, or together are an alkylene radical, which possess arthropodicidal properties, and which form synergistic compositions with carbamates, carboxylic acid esters, phosphoric and phosphonic acid esters, cycloalkanes and halogenoalkanes.

Combating arthropods with 5-(3,4-methylenedioxybenzyl)-dioxolanes and

An improved process has been invented for the production of (1-chloroethenyl)-oxirane which comprises dehydrochlorinating (1,2-dichloroethyl)-oxirane with a solution of the sodium salt of an alcohol having at least 5 carbon atoms in said alcohol and separating the (1-chloro-ethenyl)-oxirane from the reaction mixture.

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Duesseldorf, Germany

Gebhard Rauleder