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Improved Method for the Cyclization of ortho-Alkynylbenzenediazonium Salts.

โœ Scribed by Nataliya A. Zolnikova; Lidiya G. Fedenok; Nikolay E. Polyakov

Book ID
102000555
Publisher
John Wiley and Sons
Year
2007
Weight
17 KB
Volume
38
Category
Article
ISSN
0931-7597

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โœฆ Synopsis

Abstract

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๐Ÿ“œ SIMILAR VOLUMES

On the cyclization of ortho-alkynylbenze
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Cyclization of ortho-(phenylethynyl)benzene diazonium salts containing groups of +C character at the para-position of the phenyl ring proceeds with closure to a pyrazole, but not to a pyridazine as is the case in the presence of neutral or -C groups.

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The cyclization of ortho-(arylethynyl)benzene diazonium salts (the Richter reaction) is studied. A reaction mechanism, which differs radically from that reported earlier is proposed and substantiated by experimental data and quantum-chemical calculations.