Disilyl-substituted compounds

Some applications of the use of substituted disilyl mercury compounds, Hg(SiXa)2 (X = Me,Cl), are shown in Table III there is an early review article (421). In most cases, the mercury compound reacts with a metal-halogen bond to give a silicon halide and mercury as byproduct, e.g. (entry 1),... 

In 2000, Pu et al. demonstrated asymmetric hetero-Diels-Alder reaction of enamide 40 and Danishefsky s diene 39 to give compound 41 as a precursor to natural compound fumonisins (Scheme 32) [56]. The most effective ligands for this reaction were 3,3 -disilyl substituted binaphthol ligand 42, and enantioselectivity of 41 reached 78% ee. 

The aldehyde is formed immediately. What happens to the other product illustrates again just how easy nucleophilic substitution at silicon can be. Two of these compounds combine together to give a disilyl ether, called a disiloxane. 

Table 6 Oxidation Potentials of 1,2-Disilyl- and 1,2-Distannyl-Substituted Ethanes and Related Compounds [9,139]...

With aluminum or zinc and aluminum chloride in acetonitrile, dimerization of the ketyl is followed by rearrangements to benzopinacolones.m The reaction proceeds via an epoxide, which becomes the major product in the presence of ethylaluminum dichloride. Aryl or vinyl substituted carbonyl compounds dimerize sonochemically in the presence of TMSCl and zinc in ethers. Pinacol disilyl ethers are obtained in yields higher than those of the silent reaction. 12,113... 

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