Highly Selective Oxidation of Organosilanes to Silanols with Hydrogen Peroxide Catalyzed by a Lacunary Polyoxotungstate
作者:Ryo Ishimoto、Keigo Kamata、Noritaka Mizuno
DOI:10.1002/anie.200904694
日期:2009.11.9
Silanol synthesis: Divacant lacunary polyoxotungstate (nBu4N+)4[γ‐SiW10O34(H2O)2] (I) is an efficient homogeneous catalyst for highlyselectiveoxidation of organosilanes to silanols with 30–60 % aqueous H2O2. Various kinds of silanes 1 containing aryl, alkyl, alkenyl, alkynyl, and alkoxy groups are chemoselectively converted into the corresponding silanols 2 in high yields with only one equivalent
硅烷醇合成:Divacant缺位polyoxotungstate(Ñ卜4 Ñ +)4 [γ-硅钨酸10 ø 34(H 2 O)2 ](我)是一种有效的均相催化剂用于向硅烷醇的有机硅烷的高度选择性氧化用30-60%含水H 2 O 2。含有芳基,烷基,烯基,炔基和烷氧基的各种硅烷1仅以一当量的H 2 O 2水溶液就可以高选择性地化学选择性转化为相应的硅烷醇2。 相对于基板。
Selective Manganese‐Catalyzed Oxidation of Hydrosilanes to Silanols under Neutral Reaction Conditions
oxidation of organosilanes to silanols with H2O2 under neutral reaction conditions has been accomplished. A variety of organosilanes with alkyl, aryl, alknyl, and heterocyclic substituents were tolerated, as well as sterically hindered organosilanes. The oxidation appears to proceed by a concerted process involving a manganese hydroperoxide species. Featuring mild reaction conditions, fast oxidation,
在中性反应条件下,用H 2 O 2进行的第一次锰催化的有机硅烷氧化为硅烷醇。可以耐受具有烷基,芳基,炔基和杂环取代基的多种有机硅烷,以及受阻位有机硅烷。氧化似乎是通过涉及氢过氧化锰物质的协同过程进行的。该方案具有温和的反应条件,快速的氧化作用,并且没有废副产物,可实现硅烷醇和硅烷二醇的低成本,生态友好的合成。
Nonclassical Ruthenium Silyl Dihydride Complexes TpRu(PPh
<sub>3</sub>
)(η
<sup>3</sup>
‐HSiR
<sub>3</sub>
H) [Tp = Hydridotris(pyrazolyl)borate]: Catalytic Hydrolytic Oxidation of Organosilanes to Silanols with TpRu(PPh
<sub>3</sub>
)(η
<sup>3</sup>
‐HSiR
<sub>3</sub>
H)
作者:Ting Yan Lee、Li Dang、Zhongyuan Zhou、Chi Hung Yeung、Zhenyang Lin、Chak Po Lau
DOI:10.1002/ejic.201000951
日期:2010.12
appropriate to describe the complexes TpRu(PPh 3 )"H 2 SiR 3 " as TpRu(PPh 3 )(η 3 -HSiR 3 H), a static structure containing H···Si···H bonding rather than a highly fluxional pair of σ-silane hydride species TpRu(PPh 3 )(H a )(η 2 -HbSiR 3 ) ⇆ TpRu(PPh 3 )(H b )(η 2 -H a SiR 3 ). One of the complexes was used for the catalytic hydrolyticoxidation of organosilanes to silanols. A mechanism, which does
X射线晶体学研究表明,将配合物TpRu(PPh 3 )“H 2 SiR 3 ”描述为TpRu(PPh 3 )(η 3 -HSiR 3 H)更合适,一种含有H的静态结构...... Si…H 键而不是高通量的 σ-硅烷氢化物对 TpRu(PPh 3 )(H a )(η 2 -HbSiR 3 ) ⇆ TpRu(PPh 3 )(H b )(η 2 -H a 3)。其中一种配合物用于将有机硅烷催化水解氧化为硅烷醇。提出了一种机制,该机制不涉及通常将硅烷氧化加成到金属中心以形成甲硅烷基氢化物,该机制得到理论计算的支持。
The preparation and chemistry of (r)-(1-naphthyl)phenylmethylsilylmethyllithium: stereochemistry at silicon in the elimination of β-hydroxysilanes.
作者:Gerald L. Larson、J.Antonio Prieto、Edgardo Ortiz
DOI:10.1016/s0040-4020(01)86636-9
日期:1988.1
acrolein and 2-methylcyclohexanone to produce the corresponding β-hydroxysilanes in good yield, but with only a 3–4% diastereomeric excess. Unfortunately, these diastereomers proved impossible to separate. Model studies employing the methyldiphenylsilyl group showed that these β-hydroxysilanes could be protiodesilylated to give the corresponding methyl alcohol. The products from the adduct with pivaldehyde