The photorearrangement of some 4-arylazopyrazolin-5-one derivatives.

Authors
Nada, AA Mohamed, NR Mahran, AM Ibrahim, YA
Citation
Aa. Nada et al., The photorearrangement of some 4-arylazopyrazolin-5-one derivatives., HETEROCYC C, 4(3), 1998, pp. 271-276
Citations number
14
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
HETEROCYCLIC COMMUNICATIONS
ISSN journal
07930283 → ACNP
Volume
4
Issue
3
Year of publication
1998
Pages
271 - 276
Database
ISI
SICI code
0793-0283(1998)4:3<271:TPOS4D>2.0.ZU;2-7
Abstract
The photochemical reactions of some azo derivatives of substituted pyrazoli n-5-one were examined. Irradiation of 4-arylazopyrazolin-5-one 1-3 gave the corresponding hydrate derivatives 4-6 via reduction of the ate group and r earrangement of the pyrazolinone ring. The photo a-cleavage of (-CO-N-Ph) i n the pyrazolinone ring is suggested leading to the formation of a diradica l. component followed by cyclization to give the final rearrangement produc ts.