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- W2332495741 abstract "Abstract Aromatic aldehydes are reductively dimerised by Me 3 SiHgSiMe 3 (I), yielding bis( O -silyl)hydrobenzoin derivatives. 1,2-Diketones undergo 1,4-addition with formation of bis( O -silyl)enediols, while esters of conjugated dicarboxylic acids give O -silyl ketene acetals: maleic yields mainly the C , O -bissilyl derivative (1,4-addition), whereas fumaric and ethylene tetracarboxylic esters yield mainly the corresponding O , O -bissilyl products (1,6-addition). 1,2- and 1,4-quinones are readily transformed by (I) to the corresponding bis O -silyl)benzenoid system. Because of length and the high polarisability of teh SiHg bonds, it is not surprising, that a variety of reaction mechanisms is involved here. All these reactions proceed much faster in HMPT as solvent than in benzene. The rate determining step has been shown in several cases to be a nucleophilic attack of (I): presumably this is generally valid for most of the reactions studied here. The subsequent reaction steps may involve free radicals. In other cases, however, the primary step is a radical one, e.g. with quinones. The reactivity of (I) is greatly affected by traces of impurities e.g. still present from the synthesis." @default.
- W2332495741 created "2016-06-24" @default.
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- W2332495741 date "1973-01-16" @default.
- W2332495741 modified "2023-09-23" @default.
- W2332495741 title "ChemInform Abstract: SYNTH. MIT VERBINDUNGEN R3M-HG-MR3 UND (R2M-HG)(N) (M=C, SI, GE, SN) 9. MITT. REDUKTIVE SILYLIERUNG VON CARBONYLVERBINDUNGEN MITTELS BIS-(TRIMETHYLSILYL)-QUECKSILBER" @default.
- W2332495741 cites W4235893297 @default.
- W2332495741 doi "https://doi.org/10.1002/chin.197303311" @default.
- W2332495741 hasPublicationYear "1973" @default.
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