Mb. Berezin et al., Synthesis and physicochemical properties of hydrobromides of alkyl-substituted dipyrrolylmethenes, RUSS J G CH, 69(12), 1999, pp. 1949-1955
Hydrobromides of [(alkylpyrrol-2(1H)-ylidenio)methyl]pyrroles (alpha,alpha-
dipyrrolylmethenes) and of their alpha,beta and beta,beta isomers were prep
ared, and their resistance to oxidative thermal degradation was studied. Th
e solvation properties of these compounds in various organic solvents were
examined spectrophotometrically and calorimetrically.