The photochemistry of 2-diazo- and 3-diazopyrroles has been investigated. The irradiation of 2-diazo-3-cyano-4-methyl-5-phenylpyrrole in various reaction solvents brings to a photolytic singlet carbene intermediate, which evolves into 2-substituted pyrroles. A substituent effects has been recognized in the irradiations of some 3-diazopyrroles in methanol.
NAGARAJAN, M.;SHECHTER, H., J. ORG. CHEM., 1984, 49, N 1, 62-74