Six new molecular GaCl3 adducts of electron rich compounds of the carbone (carbodiphosphorane, tetraaminoallene) and cyclic alkyl amino carbene (CAAC) families have been synthesized and characterized by X-ray crystallography. The sum of their Cl-Ga-Cl angles has been compared to those of 20 other complexes exhibiting various oxygen-, nitrogen-, phosphorus-, and carbon-donor ligands for which good quality X-ray analyses have been reported. The pyramidalization of the GaCl3 moiety in L center dot GaCl3 complexes has been checked against the computed antisymmetric stretching of the Ga-Cl bonds. It has also been compared to the symmetric stretching of the C-O bonds of the corresponding L center dot Ni(CO)(3) complexes (Tolman Electronic Parameter). On this basis, a relationship between the pyramidalization observed in the gallium complexes and the electronic ligand properties has been established.
作者:Jörn E. Münzer、Grégoire H.R. Sieg、Robert Vehlies、Patrick A. Fuzon、Xiulan Xie、Bernhard Neumüller、Istemi Kuzu
DOI:10.1016/j.poly.2020.115014
日期:2021.3
Carbodiphosphorane-Catalyzed Hydroboration of Ketones and Imines
作者:Cara R. Aversa-Fleener、Daniel K. Chang、Allegra L. Liberman-Martin
DOI:10.1021/acs.organomet.1c00628
日期:2021.12.27
We report the use of a cyclic carbodiphosphorane catalyst for ketone and imine hydroboration reactions. Ketone hydroboration reactions are particularly rapid, typically reaching completion within 15 min using a 1 mol % catalyst loading at 25 °C. To our knowledge, this represents the first use of a carbodiphosphorane as an organocatalyst. The carbodiphosphorane exhibited superior catalytic activity
我们报告了在酮和亚胺硼氢化反应中使用环状碳二正膦催化剂。酮硼氢化反应特别快,通常在 25 °C 下使用 1 mol% 催化剂负载在 15 分钟内完成。据我们所知,这代表了碳二正膦作为有机催化剂的首次使用。与测试的其他中性碳亲核试剂(包括 N-杂环卡宾、N-杂环烯烃和磷叶立德)相比,碳二正膦表现出优异的催化活性。