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The reaction of [W(CPh)Br(CO) 2 (py)2] (1) with one equivalent of triisopropylphosphine gives [W(CPh)Br(CO) 2 (py)(P-i-Pr 3 )] (3). The reaction of 1 with two equivalents of triisopropylphosphine under irradiation with visible light affords trans-[W(CPh)Br(CO) 2 (P-i-Pr 3 )2] (4). Substitution of the pyridine ligand in 3 by other ligands L (t-butylisocyanide, trimethylphosphine and trimethylphosphite) gives the complexes [W(CPh)Br(CO) 2 (L)(P-i-Pr 3 )]. Reaction of 4 with t-butylisocyanide gives trans-[W(CPh)Br(CO)(CNCMe 3 )(P-i-Pr 3 ) 2 ]. Irradiation of [W(CPh)Br(CO) 2 (tmeda)] in the presence of excess trimethylphosphine gives [W(CPh)Br(CO)(PMe 3 ) 3 ]. The reaction of 1 with maleic anhydride gives [W(CPh)Br(CO)(C 4 H 2 0 3 )(py) 2 ].

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Selektive Ligandensubstitutionsreaktionen an Carbin-Wolframkomplexen des Typs [W(CPh)Br(CO) 2 L 2 ] (L = Stickstoff-Donorligand) / Selective Ligand Substitution Reactions on Carbyne Tungsten Complexes of the Type [W(CPh)Br(CO) 2 L 2 ] (L = Nitrogen Donor Ligand)