HYDROXYPHENYL-PYRAZOLYL-MALONONITRILES, A NEW CLASS OF POLYMETHINE-TYPE COLORFORMERS - SYNTHESES WITH NITRILES .92.

Authors
DWORCZAK R GLASER H BIZA P JUNEK H
Citation
R. Dworczak et al., HYDROXYPHENYL-PYRAZOLYL-MALONONITRILES, A NEW CLASS OF POLYMETHINE-TYPE COLORFORMERS - SYNTHESES WITH NITRILES .92., Dyes and pigments, 21(1), 1993, pp. 75-86
Citations number
14
Journal title
Dyes and pigments → ACNP
ISSN journal
01437208
Volume
21
Issue
1
Year of publication
1993
Pages
75 - 86
Database
ISI
SICI code
0143-7208(1993)21:1<75:HANCOP>2.0.ZU;2-P
Abstract
Addition of phenols 2a-h to 4-(dicyanomethylene)-pyrazolones 1a-c yiel ded disubstituted malononitriles 3a-g or benzofuran-3-carbonitriles 5a -c depending on the substitution of the phenol. 3a-g were converted in to dyes 4a-g by heating or UV irradiation. The phenolic OH groups in 4 a-g are easily deprotonated, forming anionic polymethine dyes (oxonole s). The color formation in poly (vinylchloride) films containing 3g wa s studied.