Abstract
3-Aza-1-chroma-1,3-butadiene undergoes photochemical [3 + 2] cyclopentannulation with alkenes and alkynes instead of the expected benzannulation or cyclobutannulation reactions, providing a good method for the synthesis of 1-pyrroline and 2H-pyrrole derivatives. This photochemical reaction can be extended to molybdenum and tungsten carbene complexes.
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