作者:Moni Chauhan、Bhanu P. S. Chauhan、Philip Boudjouk
DOI:10.1021/ol005507t
日期:2000.4.1
highly selective catalytic route to silylesters is reported. Commercially available silanes with Si-H functionality were converted to silyl or siloxy esters in the presence of Pd(OAc)2 under mild reaction conditions. This protocol was found to be equally applicable for the modification of multiple silicon centers in one framework and lead to the corresponding polysilyl esters in high yields. A comparison
Method for Producing Acyloxysilanes, Acyloxysilanes Obtained Thereby, and Use of Same
申请人:NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
公开号:US20180044359A1
公开(公告)日:2018-02-15
An object of the invention is to provide a method for efficiently producing an acyloxysilane which is useful as a functional chemical, an acyloxysilane obtained thereby, and the use thereof. The present invention provides: a method for producing an acyloxysilane, including a reaction step of reacting an alkoxysilane with a carboxylic anhydride in the presence of a catalyst, wherein the alkoxysilane is a specified alkoxysilane represented by General Formula (I), the carboxylic anhydride is a specified carboxylic acid represented by General Formula (IIA) or (IIB), the catalyst is an acid catalyst, and an acyloxysilane obtained in the reaction step is a specified acyloxysilane represented by General Formula (IIIA) or (IIIB); and the use of the acyloxysilane as a surface treatment agent or the like.
Catalytic Enantioselective Mannich-type Reactions of Ketoimines
作者:Yutaka Suto、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1021/ja068226a
日期:2007.1.1
(10 mol %) and (EtO)2Si(OAc)2 as the trapping reagent (1 equiv) of the intermediate copper amide (generated via the addition of a copper enolate to the imine). The trapping reagent significantly facilitated the catalyst turnover. Excellent enantioselectivity was produced from a range of aromatic ketoimines, including heteroaromatic and ethyl-substituted ketoimines. The optimized conditions for aliphatic
Hydrosilane cleavage reactions accelerated by tartaric acid and dimethyl sulphoxide
作者:Michael J. Roth、Michael A. Brook、Helen B. Penny
DOI:10.1016/0022-328x(96)06299-7
日期:1996.8
Tartaric acid reacts spontaneously with triethoxysilane (HTES) liberating hydrogen gas, but alkyl- or arylhydrosilanes are essentially inert under these conditions. Other α-hydroxyacids reacted similarly with HTES. The reaction of tartaric acid in tetrahydrofuran is a second order process, consistent with a reaction pathway involving first transesterification of HTES by tartaric acid and subsequent
酒石酸与三乙氧基硅烷(HTES)自发反应释放出氢气,但是烷基或芳基氢硅烷在这些条件下基本上是惰性的。其他α-羟基酸与HTES的反应相似。酒石酸在四氢呋喃中的反应是第二级过程,这与涉及首先由酒石酸使HTES酯交换并随后进行SiH裂解的反应途径一致。在二甲亚砜(DMSO)中,反应要快得多,并且速率分布更复杂。反应的初始阶段遵循二级动力学。建议该反应通过涉及DMSO的配位中间体进行。其结果是促进了酯交换反应以产生许多不同的含SiH中间体,例如3-7,并增加了氢化硅的亲核性。反应产物是无定形固体。考试方式由这些缩合得到的有机改性的溶胶-凝胶低聚物的29 Si NMR光谱显示,存在与超配位物种相容的尖峰,这些尖峰随时间变化为与Q 4(SiO 2)物种一致的宽信号。