Silicon—germanium bonds

The tetrametalmethane species la,b which contains carbon bonded to germanium, silicon, tin, and boron have been obtained (Equations (5) and (6)),7 and the overall yield of la,b varies with the order of attachment of the different metals. 

Silicon and germanium hydrides react with cobalt, manganese and rhenium carbonyls affording complexes having a silicon (or germanium)-metal bond. These reactions, described previously for inactive compounds have been used in the synthesis of optically active silyl and germyl-transition metals ... 

Element-element bonds, addition to G-G multiple bonds arsenic—selenium bonds, 10, 782 boron—boron bonds, 10, 727 boron—sulfur bonds, 10, 778 B-S and B-Ge bonds, 10, 758 chalcogen—chalcogen additions, 10, 752 germanium—germanium bonds, 10, 747 germanium-tin bonds, 10, 780 overview, 10, 725-787 phosphorus—phosphorus bonds, 10, 751 phosphorus—selenium bonds, 10, 782 phosphorus-sulfur bonds, 10, 781 Se-Si and Se-Ge bonds, 10, 779 silicon-germanium bonds, 10, 770 silicon-phosphorus bonds, 10, 780 silicon-silicon bonds, 10, 734 silicon-sulfur bonds, 10, 779 silicon-tin bonds, 10, 770 tin-boron bonds, 10, 767 tin-tin bonds, 10, 748... 

Homonuclear carbonyl dimers, palladium complexes, 8, 206 Homonuclear element-element bonds, addition to C-C multiple bonds boron-boron bonds, 10, 727 chalcogen-chalcogen additions, 10, 752 germanium-germanium bonds, 10, 747 phosphorus-phosphorus bonds, 10, 751 silicon—silicon bonds, 10, 734 tin—tin bonds, 10, 748... 

A characteristic feature of the exchange reactions on germanium as compared to silicon is the much faster rate of equilibration observed for analogous germanium compounds. But again, in view of the stability of germanium-carbon bonds with respect to redistribution and the ease with... 

The compound in entry 22, (OC)4CoSiCo3(CO)9 (LII), results when a mixture of Sil4 and Na Co(CO)4 in hexane is warmed and irradiated probably ISiCosCCOlg is formed as an intermediate (396). The tetrahedral SiCos unit parallels that found in many methylidyne tricobalt clusters of the type RCCosCCOlg (358, 401) a germanium analog of compound (LII) is known, but apparently not one with tin (71,389). One of the first reported SiCos cluster derivatives was the silicon-silicon bonded species in entry 23 (269). 

N. S. Vyazankin 353 (1969) ium derivatives with silicon-metal and germanium-metal bonds (72) silicon Chem., Bordeaux, 1968... 

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