AN EFFICIENT SYNTHESIS OF 4-DIMETHOXYPHOSPHONYL SUBSTITUTED PYRAZOLESAND PYRAZOLINE-5-ONES

Authors
KHOTINEN AV POLOZOV AM
Citation
Av. Khotinen et Am. Polozov, AN EFFICIENT SYNTHESIS OF 4-DIMETHOXYPHOSPHONYL SUBSTITUTED PYRAZOLESAND PYRAZOLINE-5-ONES, Phosphorus, sulfur and silicon and the related elements, 83(1-4), 1993, pp. 53-58
Citations number
23
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Phosphorus, sulfur and silicon and the related elements → ACNP
ISSN journal
10426507
Volume
83
Issue
1-4
Year of publication
1993
Pages
53 - 58
Database
ISI
SICI code
1042-6507(1993)83:1-4<53:AESO4S>2.0.ZU;2-1
Abstract
2-Dimethoxyphosphonyl-1,3-dicarbonyl compounds (la-c) were used for th e synthesis of 1-dimethoxyphosphonyl substituted pyrazoles (2a-e) and pyrazoline-5-ones (5a-c). Intermediate hydrazones (3b, c) were also is olated. 5a exists in the OH tautomeric form, whereas 5c-in the NH form . Tautomeric transition from the OH into the NH form was found for 5b at the melting point.