PROCESS FOR THE PREPARATION OF ISOCHROMAN DERIVATIVES

PROCESS FOR THE PREPARATION OF ISOCHROMAN DERIVATIVES

A process for the preparation of an isochromane of the formula in which R1 and R2 are identical or different and denote hydrogen, lower alkyl or lower alkoxy, or together form a cyclopentane or cyclohexane ring which is optionally substituted by lower alkyl and R3 denotes hydrogen or lower alkyl, co...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: FINKELMEIER, HORST, HOPP, RUDOLF
Format: Patent
Sprache:eng ; ger
Schlagworte:
APPARATUS THEREFOR
CHEMISTRY
GENERAL METHODS OF ORGANIC CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Beschreibung
Zusammenfassung:A process for the preparation of an isochromane of the formula in which R1 and R2 are identical or different and denote hydrogen, lower alkyl or lower alkoxy, or together form a cyclopentane or cyclohexane ring which is optionally substituted by lower alkyl and R3 denotes hydrogen or lower alkyl, comprising reacting an alcohol of the formula with formaldehyde and a carboxylic acid anhydride of the formula or with a methylene diester of the formula in which R4 represents a lower alkyl radical, in the presence of an acid catalyst. The products are known, having a musk-like odor.