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Bis(dicyanomethylene) and Bis(cyanoimino) Derivatives of Indigo and Thioindigo
Author(s) -
Gompper Rudolf,
Hartmann Karsten,
Kellner Robert,
Polborn Kurt
Publication year - 1995
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199504641
Subject(s) - indigo , chemistry , nuclear chemistry , photochemistry , optics , physics
Indigo in which O is replaced by C(CN) 2 (1) or NCN was prepared for the first time. Both compounds and their derivatives absorb in the near‐IR at considerably longer wavelengths than indigo. Attempts to synthesize the analogous thioindigo derivatives led to compounds 2‐4 (X = S, SO 2 ) by reaction sequences that were sometimes unexpected.