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The various reactive sites in the 16 e complex 1 invite addition reactions with alkynes. After addition of 2 to one of the Rh-S bonds, B-H activation takes place which finally leads to the complex 3, in which a B(3)/B(6)-disubstituted o-carborane cage is present for the first time.

A convenient route to the stanna[n]ferrocenophanes 1 and 2 is presented. The series of homologous hetero[2]ferrocenophanes of the type [Fe(C5H4EMe2)2] (E = C, Si, Sn) is thus supplemented by 1. A comparison of the molecular structures (for E = C, Si, Sn) reveals that as the EE bond length increases, the strain in the [2]ferrocenophane molecule decreases.

The reaction of bis(triphenylphosphane)(ethene)platinum(0) (1) with organotin compounds such as hexamethyldistannane (2), 1,1,2,2-tetramethyl-1,2-distanna[2]ferrocenophane (3), bis(trimethylstannyl)ethyne (4'), and trimethylstannylethynyl-bis(diethylamino)borane (4'') affordsÐunder liberation of ethene and cleavage of the Sn ± Sn bondÐthe bis(triphenylphosphane)platinum(ii) complexes 5 a ± 8 a.

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