Solution and solid-state studies of 3,4-dichloro-2,5-diamidopyrroles: formation of an unusual anionic narcissistic dimerElectronic supplementary information (ESI) available: synthesis and characterisation of compounds 3 and 4. See http://www.rsc.org/suppdata/cc/b2/b200980c/

Abstract

3,4-Dichoro-1H-pyrrole-2,5-dicarboxylic acid bis-phenylamide 3 and 3,4-dichoro-1H-pyrrole-2,5-dicarboxylic acid bis-butylamide 4 have been prepared and shown to deprotonate in the presence of basic anions: the X-ray crystal structure of the tetrabutylammonium salt of 3-H⁺ reveals the formation of a dimer in the solid state.