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The photoreaction of the indenyl complexes C 9 H 7 M(CO) 3 CH 3  (M = Mo, W) with alkynes (L) in solution leads to 1:1 adducts, which are found to be metallocyclic alkenylketone compounds C 9 H 7 M(CO) 2 (L-COCH 3 ). UV irradiation of C 9 H 7 W(CO) 3 CH 3  in the presence of either acetylene or methylacetylene also gives substituted derivatives C 9 H 7 W(CO)(L)CH 3  in low yields. For these compounds, the intramolecular mobility of the π-bonded alkyne ligand can be demonstrated by temperature-dependent  1 H NMR spectroscopy.

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Photochemische Umsetzungen von η 5 -Indenyl-tricarbonyl-methyl-molybdän und -wolfram, C 9 H 7 M(CO) 3 CH 3  (M = Mo, W), mit Acetylenen / Photochemical Reactions of Indenyl-tricarbonyl-methyl-molybdenum and -tungsten, C 9 H 7 M(CO) 3 CH 3  (M = Mo, W), with Acetylenes