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Syntheses with Nitriles, IXC. Preparation, Structure, and Color of 4‐[(Cyano)indolylmethylene]‐ and 4‐[(Cyano)pyrrolylmethylene]‐1 H ‐pyrazol‐5(4 H )‐ones
Author(s) -
Dworczak Renate,
Fabian Walter M. F.,
Sterk Heinz,
Kratky Christoph,
Junek Hans
Publication year - 1992
Publication title -
liebigs annalen der chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 0170-2041
DOI - 10.1002/jlac.199219920103
Subject(s) - chemistry , pyrazolones , yield (engineering) , thermal decomposition , nitrile , decomposition , proton nmr , spectroscopy , nuclear magnetic resonance spectroscopy , medicinal chemistry , organic chemistry , materials science , physics , quantum mechanics , metallurgy
(Dicyanomethylene)pyrazolones 1a , b are treated with some indoles and pyrroles. The resulting disubstituted malono‐nitriles 2a – f , 4a – e , 6 yield cyanomethylene compounds 3a – f , 5a – e , 7 by irreversible thermal or photochemical decomposition. The compounds exist in different isomeric forms. Structures are proven by NMR spectroscopy and X‐ray analysis. UV‐Vis data are discussed by means of AM1 and INDO/S‐CI calculations.