Sumitomo Chemical Company, Limited

Itaru Kawata

Tamio Shirafuji

Kiyomi Sakai

Kensen Okusako

Tetuya Suzuta

Yasumoto Simazu

A process for producing a 3,4-dihydrocoumarin compound represented by formula (II): ##STR1## wherein R.sub.1 to R.sub.4 are as defined in the specification, comprising the steps of:

Process for producing 3,4-dihydrocoumarin derivatives

A industrially excellent method for producing a cycloalkanol by the hydration of a cycloalkene having from 4 to 8 carbon atoms with an aromatic sulfonic acid as a catalyst which comprises carrying out said hydration in the presence of a phenol.

Method for producing cycloalkanols

An industrially excellent method for separating cyclohexanol which comprises carrying out the hydration of cyclohexane in the presence of an acid, and bringing the reaction solution into contact with a mixed solution of a hydrocarbon and phenol to extraction-separate cyclohexanol from the reaction solution.

Method for separating cyclohexanol

A method for producing cycloalkanols important as a material for caprolactam, adipic acid and the like, which comprises carrying out the catalytic hydration of a cycloalkene using as a catalyst an aromatic sulfonic acid having at least one hydroxyl or ether group and separating the resulting cycloalkanol from the reaction solution by extraction.

A method for producing alicyclic alcohols by the hydration of olefins in the presence of an aromatic sulfonic acid, which comprises incorporating molybdic acid or its salt and/or vanadium oxide, vanadic acid or its salt in the reaction system. The alicyclic alcohols are useful as intermediates for caprolactam, adipic acid, insecticides, etc.

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Niihama, Japan

Itaru Kawata