Use of Silylated Formiates as Hydrosilane Equivalents
申请人:Commissariat a l'Energie Atomique et aux Energies Alternatives
公开号:US20210292345A1
公开(公告)日:2021-09-23
The present invention relates to a method for preparing organic compounds of formula (I) by reaction between a silylated formiate of formula (II) and an organic compound in the presence of a catalyst and optionally of an additive.
The invention also relates to use of the method for preparing organic compounds of formula (I) for the preparation of reagents for fine chemistry and for heavy chemistry, as well as in the production of vitamins, pharmaceutical products, adhesives, acrylic fibres, synthetic leathers, and pesticides.
An iron catalyst is shown for the first time to promote transfer hydrosilylation with silyl formates and is utilized for the silylation of alcohols. Attractive features of this protocol include the use of an earth-abundant transition-metal catalyst, mild reaction conditions, and the release of gases as the only byproducts (H 2 and CO 2 ).
铁催化剂首次被证明可促进甲酸甲硅烷基的转移氢化硅烷化,并用于醇的硅烷化。该协议的吸引人的特点包括使用地球上丰富的过渡金属催化剂、温和的反应条件以及作为唯一副产品 (H 2 和 CO 2 ) 的气体释放。
IMINE-TYPE QUATERNARY AMMONIUM SALT CATALYST, PREPARATION METHOD THEREOF AND USE THEREOF FOR PREPARATION OF POLYISOCYANATE COMPOSITION
申请人:Wanhua Chemical Group Co., Ltd.
公开号:US20200377445A1
公开(公告)日:2020-12-03
Disclosed is an imine-type quaternary ammonium salt catalyst, wherein the catalyst has a general structure formula shown by formula I below; in the formula, R1 and R2, respectively, are independently selected from a C1-C20 linear alkyl or a branched C3-C20 alkyl, and a C1-C20 hydroxylalkyl, a C3-C8 cycloalkyl, and arylated alkyl; R3 is a linear or branched alkyl, cycloalkyl or aryl; and R4 is hydrogen, aryl, a linear C1-C15 alkyl or branched C3-C15 alkyl. Also disclosed are a method for preparing the catalyst and a polyisocyanate composition prepared therefrom. The catalyst, by introducing an imine structure, on the basis of ensuring high catalytic activity thereof, is allowed to have properties of high temperature decomposition and inactivation, and when applied to the synthesis of polyisocyanate, can effectively prevent the risk of explosive polymerization caused by an uncontrolled reaction.
Trimethylsilyl group migration in the Criegee intermediate of gas-phase ozonolysis of trimethylsilylethenes
作者:Radek Fajgar、Josef Pola
DOI:10.1016/s0040-4039(00)00149-0
日期:2000.4
GC, GC/MS and GC/FTIR analyses of the final products of ozonolysis of trimethylsilylethene and trans-1,3-bis(trimethylsilyl)ethene reveal that the ester channel of decomposition of the Criegee intermediate takes place exclusively via migration of Me3Si group.