Photochemische Reaktionen von Übergangsmetall-Olefin-Komplexen, II Die Umsetzung von Tricarbonyl-η-1.3.5-cycloheptatrien-chrom(O) mit substituierten Fulvenen /Photochemical Reactions of Transition Metal Olefin Complexes, II The Reaction of Tricarbonyl-η-1,3,5-cycloheptatriene-chromium(O) with Substituted Fulvenes

Abstract

Abstract When tricarbonyl-η-1,3,5-cycloheptatriene-chromium(O) (1) and 6,6-dimethylfulvene or tricarbonyl-η-6,6-dimethylfulvene-chromium(O) and 1,3,5-cyeloheptatriene are irradiated with UV light, a red crystalline dicarbonyl-chromium complex with an η3 -1′,2′,3′-(2-cyclohepta-2′, 4′ -dien 1′ ,6′-ylene)-η5 (2-cyclopentadienylidene)propane chelate ligand, Cr(CO)2C15H18 (2), is formed in high yields. Under the same conditions, 1 with 6,6-diphenylfulvene yields two isomeric complexes. One of them, Cr(CO)3C25H22 (3), is analoguous to 2 and contains the η3 -1′,2′,3′-cyclohepta-2′,4′-dien-1′ ,6′ / -ylene-η5 -cyclopentadienylidene-diphenyl-methane chelate ligand. The other one is the dicarbonyl η3 -1′,2′,3′-cyclohep-tatrienyl- η5 diphenylmethylcyclopentadienyl-chromium(O), Cr(CO)2(C7H7)(Ci8H15) (4). The complexes were characterized by analysis and mass spectra. The structures are based on IR, and 1H and 13C NMR spectra. Einführung