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Beckmann rearrangement of ketoximes on solid metaboric acid: a simple and effective procedure

✍ Scribed by Sosale Chandrasekhar; Kovuru Gopalaiah

Book ID
104250706
Publisher
Elsevier Science
Year
2002
Tongue
French
Weight
65 KB
Volume
43
Category
Article
ISSN
0040-4039

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✦ Synopsis

When ketoximes admixed with solid metaboric acid (formed from boric acid at 100Β°C/0.1 Torr) are heated ( 140Β°C/7-42 h), the corresponding amides or lactams are produced in excellent yields (62-92%) via the Beckmann reaction. Aromatic aldoximes undergo both dehydration to the nitrile as well as (non-stereospecific) rearrangement under the above conditions. The absence of solvent, and the mildness and low toxicity of boric acid, characterise the present procedure.

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