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A New Access to Diarylmaleic Anhydrides

✍ Scribed by Egle M. Beccalli; Maria Luisa Gelmi; Alessandro Marchesini

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
200 KB
Volume
1999
Category
Article
ISSN
1434-193X

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✦ Synopsis

A new three-step synthesis of diarylmaleic anhydrides 6, starting from 3-aryl-2-hydroxybut-2-enedioates 2, is reported.

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## Abstract The hydrogenation of 5‐oxo‐5__H__‐5Ξ»^5^‐dibenzophosphol‐5‐ol gives, almost quantitatively, only one geometric isomer of 5‐oxododecahydro‐5Ξ»^5^‐dibenzophosphol‐5‐ol (**2**). An X‐ray structure analysis confirmed the formation of a __meso__ isomer with a 4aΞ²,5aΞ²,9aΞ²,9bΞ² configuration (**2