Coupling Reactions of Ferrocenylacetylene with Mononuclear Metal Carbonyls Fe(CO)5and M(CO)6(M = Mo, W): Synthesis and Characterization of [Fe(CO)2{η5-2,5-Fc2C5H2CO}C(Fc)CH], [Fe(CO)2{η2:η2-2,5-Fc2C4H2Fe(CO)3}-μ-CO], [Fe(CO)3{η2:η2-2,5-Fc2C4H2CO}], 1,2,4-Triferrocenylbenzene, 2,5-Diferrocenylthiophene, and 2,5-Diferrocenylselenophene
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