The alkyne RCCR, R = CO2Me, reacts with 5-membered metallacycles [PtMe2{SnMe2ESnMe2E}(bu2bpy)], E = S, Se or Te, bu2bipy = 4,4′-di-tert-butyl-2,2′-bipyridine, yielding the corresponding 7-membered metallacycles [PtMe2{SnMe2ESnMe2CRCRE}(bu2bpy)] which slowly eliminate “Me2SnE” to give new 5-membered metallacycles [PtMe2{SnMe2CRCRE}(bu2bpy)]; further reaction of which with excess RCCR gives [PtMe2(CRCRH)(CCR)(bu2bpy)], a complex which contains alkyl, alkenyl and alkynyl functionalities in the same molecule.
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Janzen et al. (1999) studied this question.
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