SCHEDULED MAINTENANCE
Reaction of a 2-unsubstituted pyrrole with acetic anhydride and stannic chloride unexpectedly promotes self-condensation to give symmetrical di(pyrrolyl)ethene as a side-product in 6–10% yield, but overall yields of these 1,1-di(pyrrolyl)ethenes can be improved to 66% using a rational alternate route; structure and chemistry of 1,1-di(pyrrolyl)ethenes 2 are discussed.
H. Xie, D. A. Lee, M. O. Senge and K. M. Smith, J. Chem. Soc., Chem. Commun., 1994, 791 DOI: 10.1039/C39940000791
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