ORGANOMETALLOIDAL DERIVATIVES OF THE TRANSITION METALS I

Abstract
The reactions of bis-trimethylsilylacetylene and bis-trimethylsilylbutadiyne with various transition metal carbonyls have been studied. Both form stable complexes of iron, cobalt and manganese. The infrared spectral data indicates that for the group IV substituted ligands the pi-accepting ability increases in the order C < Si < Sn. Mass spectral data provides evidence for the existence of novel bis-cyclobutadiene iron fragments and also the unknown tetra-silylcyclobutadiene.