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C-Phosphorylated pyrazoles. Reaction of N-methyl- and N-phenylpyrazoles with phosphorus(III) halides

✍ Scribed by Andrew A. Tolmachev; Anzhelika I. Sviridon; Alexander N. Kostyuk; Alexander M. Pinchuk

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
738 KB
Volume
6
Category
Article
ISSN
1042-7163

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✦ Synopsis

The reactions of N-methyl-and N-phenylpyrazole derivatives with phosphorus(ll1) halides have been studied. The preparative method for synthesis of a variety of 4-phosphorylated pyrazoles, including pyrazolyl substituted halo-and dihalophosphines, has been elaborated. Migration of an alkyl group from 0 to P(III) in 4-phosphorylated 5-alkoxypyrazoles was found to give a P-ylides in a vinylogous manner with respect to the Arbuzov reaction.

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