One pot tandem dual CC and CO bond reductions in the β-alkylation of secondary alcohols with primary alcohols by ruthenium complexes of amido and picolyl functionalized N-heterocyclic carbenes
作者:A. P. Prakasham、Sabyasachi Ta、Shreyata Dey、Prasenjit Ghosh
DOI:10.1039/d1dt02849a
日期:——
investigation performed on two representative catalytic substrates, 1-phenylethanol and benzyl alcohol using the neutral ruthenium (1c) complex showed that the catalysis proceeded via a partially reduced CC hydrogenated carbonyl species, [PhCOCH2CH2Ph] (3′), to the fully reduced CO and CC hydrogenated secondary alcohol, [PhCH(OH)CH2CH2Ph] (3). Furthermore, the time dependent study showed that the major product
A new Mn‐catalyzed alkylation of secondary alcohols with non‐activated alcohols is presented. The use of a stable and well‐defined manganese pincer complex, stabilized by a PNN ligand, together with a catalytic amount of base enabled the conversion of renewable alcohol feedstocks to a broad range of higher‐value alcohols in good yields with water as the sole byproduct. The strategy eliminates the need
Organic anions. Part 1. Equilibration of 1,3-diarylpropenes
作者:Richard J. Bushby、Gerald J. Ferber
DOI:10.1039/p29760001683
日期:——
A number of 1,3-diarylpropenes, potential precursors of the allylic anions (I). have been synthesised, and the base catalysed equilibration between the double bond isomers (II) and (III) has been investigated. The equilibrium constants correlate satisfactorily with the substituent constant σ. N.m.r. shift reagents aided spectroscopic analysis of certain mixtures.
benign cobaltouschloride efficiently accomplishes the catalytic β-alkylation of alcohols in air at 140 °C. At higher loadings of cobaltouschloride (1 mol%) in the presence of 2.5 mol% NaOtBu, there is a rapid formation of heterogeneous Co nanoparticles (NPs) which are apparently sensitive to air and result in poor yields (ca. 25%) of β-alkylated products. In contrast, performing the reaction in an
价格低廉、地球资源丰富且对环境无害的氯化钴可在 140 °C 的温度下有效地在空气中实现醇的催化 β-烷基化。在存在 2.5 mol% NaO t Bu 的情况下,在较高的氯化钴负载量 (1 mol%) 下,会快速形成对空气明显敏感的异质 Co 纳米颗粒 (NPs),导致产率低 ( ca. 25% ) 的 β-烷基化产物。相比之下,在其他相同条件下在氩气气氛中进行反应会导致更高的产率(约44%)。通过在 2.5 mol% NaO t存在下以较低 (0.01 mol%) CoCl 2负载运行可以延迟空气中的异质化和最终活性损失卜在 140 °C。在这些条件下,醇的催化 β-烷基化以高产率(高达 89%)和前所未有的周转率(约8900 年)进行。机理研究表明基于原位生成的醇分子 Co 配合物的催化剂的参与。标记研究为 C-H 活化参与氯化钴催化的 β-烷基化提供了关键证据,KIE 为 1.61
USE OF PROPANOL AND PROPENOL DERIVATIVES AS ANTIOXIDANTS
申请人:MERCK PATENT GmbH
公开号:US20150051295A1
公开(公告)日:2015-02-19
The invention relates to the use of propanol and propenol derivatives as antioxidants, to compositions comprising propanol and propenol derivatives and the preparation thereof, and to certain propanol and propenol derivatives and the preparation thereof.