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An ab initio quantum chemical study of the thermal decomposition of pyrrole to hydrogen cyanide and propyne is reported. Using CASSCF, CASPT2 and G2(MP2) methods three distinct pathways are investigated. The crucial step in each is a 1,5 sigmatropic shift that results in the concerted decomposition of an imine intermediate. The lowest energy pathway proceeds via a cyclic carbene, which, by ring...