光氧化还原和极性反转催化的协同组合使硅烷与 H 2的析氢交叉偶联成为可能O、醇、酚和硅烷醇,它们分别以中等至极好的收率提供相应的硅烷醇、单甲硅烷基醚和二甲硅烷基醚。在仅存在有机光催化剂 4-CzIPN 和硫醇 HAT 催化剂的情况下,Si-H 和 O-H 的脱氢交叉偶联顺利进行,底物范围广,官能团相容性好,不需要任何金属、外部氧化剂和质子还原剂,这与之前报道的光催化析氢交叉偶联反应不同,后者通常需要质子还原助催化剂,如钴络合物。从机制上讲,生成甲硅烷基阳离子中间体以促进交叉偶联反应,因此代表了一种前所未有的生成甲硅烷基阳离子的方法通过可见光光氧化还原催化。
Highly Efficient Iridium-Catalyzed Oxidation of Organosilanes to Silanols
作者:Youngjun Lee、Dong Seomoon、Sundae Kim、Hoon Han、Sukbok Chang、Phil Ho Lee
DOI:10.1021/jo035647r
日期:2004.3.1
Hydrolytic oxidation of organosilanes to the corresponding silanols can be performed highlyefficiently with a catalyst system of [IrCl(C8H12)]2 under essentially neutral and mild conditions, and various types of silanols are produced in good to excellent yields.
使用[IrCl(C 8 H 12)] 2催化剂体系,可以在基本上中性和温和的条件下高度有效地将有机硅烷水解氧化为相应的硅烷醇,并且可以以良好至极好的收率生产各种类型的硅烷醇。
Nuclear magnetic resonance spectra of benzylsilanes and phenyldisilanes
作者:Frank K. Cartledge、Knut H. Riedel
DOI:10.1016/s0022-328x(00)88667-2
日期:1972.1
of substituted benzyldimethylsilanes (I) and phenyltetramethyldisilanes (II) are reported. 29SiH and 13CH coupling constants are shown to be correlated by Hammett σ constants. The data are discussed in terms of mechanisms of transmission of substituent effects across C—Si and Si—Si bonds. A good Hammettcorrelation is also found of J(13CH) for the benzylic protons of a series of substituted toluenes
photocatalytic hydrogen evolution cross-coupling reactions where a proton reduction cocatalyst such as a cobalt complex is generally required. Mechanistically, a silyl cation intermediate is generated to facilitate the cross-coupling reaction, which therefore represents an unprecedented approach for the generation of silyl cation via visible-light photoredox catalysis.
光氧化还原和极性反转催化的协同组合使硅烷与 H 2的析氢交叉偶联成为可能O、醇、酚和硅烷醇,它们分别以中等至极好的收率提供相应的硅烷醇、单甲硅烷基醚和二甲硅烷基醚。在仅存在有机光催化剂 4-CzIPN 和硫醇 HAT 催化剂的情况下,Si-H 和 O-H 的脱氢交叉偶联顺利进行,底物范围广,官能团相容性好,不需要任何金属、外部氧化剂和质子还原剂,这与之前报道的光催化析氢交叉偶联反应不同,后者通常需要质子还原助催化剂,如钴络合物。从机制上讲,生成甲硅烷基阳离子中间体以促进交叉偶联反应,因此代表了一种前所未有的生成甲硅烷基阳离子的方法通过可见光光氧化还原催化。