Bayer Aktiengesellschaft

Haarmann & Reimer Gmbh

Gotz Blume

Hans-Otto Muller

Paul-Christian Fiedler

Winfried Rosen

A new process for the preparation of 1-chloro-2-(1-chloro-cyclopropyl)-3-(2-chloro-phenyl)-propan-2-ol of the formula ##STR1## and/or 2-(1-chloro-cyclopropyl)-2-(2-chloro-benzyl)-oxirane of the formula ##STR2## comprising a) reacting in a first step, 2-chloro-benzyl chloride of the formula ##STR3## with comminuted magnesium in the presence of a mixture of toluene and tetrahydrofuran, in which the ratio of toluene to tetrahydrofuran is between 65:35 and 95:5 parts by weight, at a temperature between 0.degree. C. and 100.degree. C., the ratio of 2-chloro-benzyl chloride to tetrahydrofuran being such that between 1 and 3 moles of tetrahydrofuran are present per mol of 2-chloro-benzyl chloride, and subsequently separating off any magnesium which may still be present, and

Process for the preparation of intermediates

1-Phenyl- and -benzyl-2,2-dichloro-cyclopropanes of the formula ##STR1## in which R.sub.1 denotes a hydrogen atom or a methyl, ethyl, propyl, methoxy or ethoxy group,

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Holzminden, Germany

Gotz Blume