Bis(catecholato)silicates: Synthesis and Structural Data

Abstract

This minireview provides an overview of the synthesized bis(catecholato)silicates based on the nature of the alkyl or aryl residues and associated cations as well as the methods developed for this purpose. Structural and analytical data such as the 29Si NMR shift of silicon penta‐ and hexacoordinate derivatives, selected examples of crystal structures by X‐ray diffraction analysis and oxidation potentials of silicates are reported. Some aspects of reactivity are also mentioned.

Synthesis and Properties of the Perfluoroethyl Martin Silicate: Reactivity in Solution and Solid‐State Mechanochemistry

“…) have been recently used as a source of alkyl radicals, [29][30][31] as an alternative to their bis(catecholato)silicate counterparts [Si(R)(cat) 2 ] À . [32,33] For both silicon species, the generation of the desired radical R . is induced by one-electron oxidation and fragmentation of the carbon-silicon bond.…”

“…Upon addition of the C 2 F 5 − anion to 1 , the synthesis of the corresponding perfluoroethylsilicate 3 is described as well as some properties and preliminary reactivity of 3 (Figure 1.e). Martin silicates ([Si(R)L 2 ] − ) have been recently used as a source of alkyl radicals, [29–31] as an alternative to their bis(catecholato)silicate counterparts [Si(R)(cat) 2 ] − [32,33] . For both silicon species, the generation of the desired radical R⋅ is induced by one‐electron oxidation and fragmentation of the carbon‐silicon bond.…”