PROCESS FOR PREPARING A PROPIOLIC ACID OR A DERIVATIVE THEREOF
申请人:Goossen Lukas J
公开号:US20140012000A1
公开(公告)日:2014-01-09
The invention relates to a process for preparing a propiolic acid or a derivative thereof by reacting a terminal alkyne with carbon dioxide, which comprises performing the reaction in the presence of a base and a copper complex, especially a copper (I) complex having at least one ligand, at least one of the ligands of the copper complex being selected from monodentate ligands which have an aminic or iminic nitrogen atom capable of coordination with copper, and polydentate ligands having at least two atoms or atom groups which are capable of simultaneous coordination with copper and are selected from nitrogen, oxygen, sulfur, phosphorus and carbene carbon.
A Lewis Base Nucleofugality Parameter, <i>N</i><sup><i>F</i></sup><sub>B</sub>, and Its Application in an Analysis of MIDA-Boronate Hydrolysis Kinetics
作者:Nicholas P. Taylor、Jorge A. Gonzalez、Gary S. Nichol、Andrés García-Domínguez、Andrew G. Leach、Guy C. Lloyd-Jones
DOI:10.1021/acs.joc.1c02729
日期:2022.1.7
The kinetics of quinuclidine displacement of BH3 from a wide range of Lewis base borane adducts have been measured. Parameterization of these rates has enabled the development of a nucleofugality scale (NFB), shown to quantify and predict the leaving group ability of a range of other Lewis bases. Additivity observed across a number of series R′3–nRnX (X = P, N; R′ = aryl, alkyl) has allowed the formulation
已经测量了从广泛的路易斯碱硼烷加合物中置换 BH 3的奎宁环动力学。这些速率的参数化使得能够开发出离核量表 (NF B ),以量化和预测一系列其他路易斯碱基的离去基团能力。在多个系列 R' 3– n R n X (X = P, N; R' = 芳基, 烷基) 中观察到的可加性允许制定相关的取代基参数 ( n f PB , n f AB ),提供了一种方法计算N F B一系列路易斯碱基的值远远超出了实验得出的值。通过取代基参数n f PB与一系列烷基和芳基 MIDA硼酸盐在中性条件下的水解速率的相关性,探索了核离性参数的效用。这允许鉴定具有接近反应中心的杂原子的 MIDA硼酸盐,显示出不寻常的动力学不稳定性或水解稳定性。
Electrophilic Phosphonium Cation‐Mediated Phosphane Oxide Reduction Using Oxalyl Chloride and Hydrogen
作者:Arne J. Stepen、Markus Bursch、Stefan Grimme、Douglas W. Stephan、Jan Paradies
DOI:10.1002/anie.201809275
日期:2018.11.12
The metal‐free reduction of phosphaneoxides with molecular hydrogen (H2) using oxalyl chloride as activating agent was achieved. Quantum‐mechanical investigations support the heterolytic splitting of H2 by the in situ formed electrophilic phosphonium cation (EPC) and phosphaneoxide and subsequent barrierless conversion to the phosphane and HCl. The reaction can also be catalyzed by the frustrated
使用草酰氯作为活化剂,实现了以分子氢(H 2)对金属氧化物氧化物的无金属还原。量子力学研究支持通过原位形成的亲电phospho阳离子(EPC)和氧化膦进行H 2的杂化裂解,以及随后的无阻转化为膦和HCl。该反应还可以通过由B(2,6-F 2 C 6 H 3)3和2,6-二甲基吡啶或氧化膦作为Lewis碱组成的沮丧Lewis对(FLP)催化。三芳基和二芳基氧化膦证明了这种新颖的还原方法,提供了以良好至极佳收率(51%至93%)的膦原子。
Aspects of the coordination chemistry of rac-trans-1,2-diphosphinocyclohexane and the preparation of reinforced 9aneP<sub>3</sub> and 9anePN<sub>2</sub> macrocycles
作者:Peter G. Edwards、Benson M. Kariuki、Paul D. Newman、Huw A. Tallis、Craig Williams
DOI:10.1039/c4dt02239d
日期:——
Rac,trans-1,2-diphosphinocyclohexane (t-chxnP2) has been prepared and coordinated to Cu(i), Ag(i), Fe(ii) and Mn(i) and the latter two metals used as templates for the formation of structurally reinforced 9aneP3 and 9anePN2 macrocycles.
PROCESS FOR THE PREPARATION OF UNSATURATED CARBOXYLIC ACIDS BY CARBONYLATION OF ALLYL ALCOHOLS AND THEIR ACYLATION PRODUCTS
申请人:BASF SE
公开号:US20200055834A1
公开(公告)日:2020-02-20
The present invention relates to a process for carbonylating allyl alcohols at low temperature, low pressure and/or low catalyst loading. In an alternative embodiment, an acylation product of the allyl alcohol is used for the carbonylation. The present invention likewise relates to the preparation of conversion products of these carbonylation products and specifically of (−)-ambrox.