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The photoreactivity of iminecarbene complexes in the presence of alkynes has been explored. Up to four different reaction paths are available depending on the alkyne and carbene complex substituents, although in each case only one type of product is isolated. 2H-Pyrrole derivatives are formed mainly from aryl alkynes. When alkyl alkynes are used, the method affords a new type of aza-dendralene product in good yields. Isoquinoline derivatives can also be formed in a two-step one-pot photochemical process when the appropriate substituents are present. Finally, indene derivatives are also available through a benzannulation reaction. To explore the underlying mechanism, we carried out computations using DFT methods. Experimental and theoretical results compare well, which allows control over the reaction and product distribution.

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Pyrrole derivatives R 0120Role of Imino Group in Photochemical Reactions of Fischer Carbene Complexes. -In continuation of previously published studies, photochemical reactions of alkenes or alkynes with Fischer carbene complexes bearing an imine and an alkoxy or amino group are investigated. The presence of the imino function effects ring formation without CO insertion. -(CAMPOS, P. J.; CARO, M.; LOPEZ-SOLA, S.; SAMPEDRO, D.; RODRIGUEZ*, M. A.; J.

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