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Synlett 1990; 1990(9): 539-540
DOI: 10.1055/s-1990-21158
DOI: 10.1055/s-1990-21158
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© Georg Thieme Verlag, Rüdigerstr. 14, 70469 Stuttgart, Germany. All rights reserved. This journal, including all individual contributions and illustrations published therein, is legally protected by copyright for the duration of the copyright period. Any use, exploitation or commercialization outside the narrow limits set by copyright legislation, without the publisher's consent, is illegal and liable to criminal prosecution. This applies in particular to photostat reproduction, copying, cyclostyling, mimeographing or duplication of any kind, translating, preparation of microfilms, and electronic data processing and storage.
Aromatization of Halogenated Tetrahydrophthalic Anhydrides with Activated Carbon. An Effective Preparation of 4,5-Dichlorophthalic Anhydride
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Publikationsverlauf
Publikationsdatum:
08. März 2002 (online)
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Halogenated tetrahydrophthalic anhydrides (4-cyclohexene-1,2-dicarboxylic anhydrides) can be aromatized to phthalic anhydrides in a simple manner by using activated carbon in a high boiling solvent (1,2,4-trichlorobenzene). The method has been applied to the preparation of 4,5-dichlorophthalic anhydride and 4-chlorophthalic anhydride starting from the corresponding chloro-substituted 4-cylohexene-1,2-dicarboxylic anhydrides.