The combination of ultrasmall nanoparticles and pseudo-single atoms of gold (Au) and fibrous nanosilica (KCC-1) functionalized with 3-aminopropyltriethoxysilane (APTS) enabled the design of KCC-1-APTS/Au nanocatalysts with very high turnover numbers (TONs). KCC-1-APTS/Au catalysed the oxidation of organosilanes to silanols, with a TON of approximately half a million (591 000 for dimethylphenyl silane
超小纳米粒子和金(Au)的假单原子以及被3-氨基丙基三乙氧基硅烷(APTS)官能化的纤维纳米二氧化硅(KCC-1)的组合,可以设计出具有非常高周转率(TONs)的KCC-1-APTS / Au纳米催化剂)。KCC-1-APTS / Au催化的有机硅烷氧化为硅烷醇,其TON约为50万(二甲基苯基硅烷为模型底物为591 000)。此外,品质因数(FOM)提供了633 mmol h -1 K -1的反应速率,所需能量,反应规模和催化剂的可回收性的综合视图。。KCC-1-APTS / Au还催化了另外两个具有挑战性的反应,即具有很高TON的硅烷的醇解和醛的氢化硅烷化。这些特性使KCC-1-APTS / Au成为一种多功能的纳米催化剂。
Highly Selective Hydroxylation and Alkoxylation of Silanes: One-Pot Silane Oxidation and Reduction of Aldehydes/Ketones
作者:Nianhua Luo、Jianhua Liao、Lu Ouyang、Huiling Wen、Yuhong Zhong、Jitian Liu、Weiping Tang、Renshi Luo
DOI:10.1021/acs.organomet.9b00716
日期:2020.1.13
An efficient chemoselective iridium-catalyzed method for the hydroxylation and alkoxylation of organosilanes to generate hydrogen gas and silanols or silyl ethers was developed. A variety of sterically hindered silanes with alkyl, aryl, and ether groups were tolerated. Furthermore, this atom-economical catalytic protocol can be used for the synthesis of silanediols and silanetriols. A one-pot silane