The reaction of ethyl orthoformate with CO + H2 (P 10–15 MPa) in the presence of ruthenium carbonyl iodide catalysts at temperatures of 130–200°C has been studied. Products of hydrogenation, carbonylation and homologation of the CH, Et and EtO moieties of the ester are formed, indicating that the catalyst can activate the substrate in three ways. Diethoxymethane was the main product at lower temperatures
研究了羰基碘化钌催化剂在130–200°C的温度下原甲酸乙酯与CO + H 2(P 10–15 MPa)的反应。形成酯的CH,Et和EtO部分的氢化,羰基化和均一化的产物,表明催化剂可以三种方式活化底物。二乙氧基甲烷是较低温度下的主要产物,而甲基乙基醚,甲醇和丙酸乙酯在较高温度下占主导地位。大量碳酸二乙酯和二乙氧基乙烷的形成表明了EtO-Ru衍生物的中间形成。CO + D 2的实验结果 这表明底物的氢化和羰基化的逐步过程,并为羰基碘化钌催化剂活化酯的机理提供了新的思路。
HANLEY, JOHN A.;FORSYTH, DAVID A., J. LABELL. COMPOUNDS AND RADIOPHARM., 28,(1990) N, C. 307-310
作者:HANLEY, JOHN A.、FORSYTH, DAVID A.
DOI:——
日期:——
Probing Hyperconjugation Experimentally with the Conformational Deuterium Isotope Effect
作者:Kyle T. Greenway、Anthony G. Bischoff、B. Mario Pinto
DOI:10.1021/jo3017988
日期:2012.10.19
deal of interest in the anomeric effect, anomeric-like hyperconjugative effects have been thoroughly investigated in oxygen-containing systems. However, such interactions in the second- and third-row chalcogens are less well-understood and have generated some controversy. Here, we show that the conformationaldeuteriumisotope effect, in combination with Saunders’ isotopic perturbation method, permits