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Beckmann reaction of oximes catalysed by chloral: mild and neutral procedures

✍ Scribed by Sosale Chandrasekhar; Kovuru Gopalaiah

Publisher: Elsevier Science
Year: 2003
Tongue: French
Weight: 81 KB
Volume: 44
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(02)02644-8

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✦ Synopsis

A variety of ketoximes undergo the Beckmann rearrangement when heated with 0.5 molar equiv. of chloral (neat melt/ 130°C), to furnish the corresponding amides in excellent yields (generally 80-95%) after simple work-up. (Aromatic aldoximes dehydrated to the corresponding nitriles in excellent yields under similar conditions.) The absence of solvent, Brønsted acids, strong Lewis acids and by-products, and a simple work-up characterise the procedures.

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