Facile synthesis of dicyanovinyl-di(meso-aryl)dipyrromethenes via a dipyrromethene–DDQ adduct†
Abstract
The dicyano-substituted vinyl dipyrromethene 4 and compound 5 are near-planar and were prepared from a simple meso-aryl dipyrromethane via the DDQ adduct 3; the unique structures of 3, 4 and 5 were confirmed by