From the room-temperature reaction of the transition-metal alkynyl Fischer carbene complexes (CO)5M=C(OEt)(C≡CPh) (M = Cr, W) with the mixed-chalcogenide compounds Fe2(CO)6(μ-EE′) (E ≠ E′, E, E′ = S, Se, Te), the following new trimetallic adducts were obtained: Fe2(CO)6μ-EC(Ph)=C(E′)[(OEt)C=M(CO) 5] 1-6 (1, 85%, E = S, E′ = Se, M = Cr; 2, 82%, E = S, E′ = Se, M = W; 3, 84%, E = S, E′ = Te, M - Cr; 4, 80%, E = S, E′ = Te, M = W; 5, 83%, E = Se, E′ = Te, M = Cr; 6, 81%, E = Se, E′ = Te, M = W). In addition, trace amounts of the corresponding alkenyl Fischer carbene complexes (CO)5M=C(OEt)-(CH=C(OMe)Ph 7-8 (7, M = Cr; 8, M = W) were also formed in each case. Compounds 1-6 were characterized by IR and 1H, 13C, 77Se, and 125Te NMR spectroscopy. Crystallographic analyses of the compounds 2, 3, and 6 were carried out. The structures of 2, 3, and 6 can be described as Fe2EE′ (E, E′ = S, Se, Te) tetrahedral butterfly cores containing the alkynyl Fischer carbene as a bridge between the two wingtip chalcogens with three terminally bonded carbonyl groups on each Fe atom.