carboxylic acids, such as benzoic acid, boost the activity of N-heterocyclic carbene (NHC) catalysts in the oxidativeesterification of aldehydes. A simple and efficient protocol for the transformation of a wide range of sterically hindered α- and β-substituted aliphatic aldehydes/enals, catalyzed by a novel and readily accessible N-Mes-/N-2,4,6-trichlorophenyl 1,2,4-triazolium salt, and benzoic acid as co-catalyst
Metal-free aminoamidiniumation employing N-iodosuccinimide: facile syntheses of bicyclic imidazolidiniums and cyclic vicinal diamines
作者:Jun Zhang、Gengtao Zhang、Weijie Wu、Xuejun Zhang、Min Shi
DOI:10.1039/c4cc07082h
日期:——
NIS-mediated aminoamidiniumation has been developed for the syntheses of bicyclic imidazolidinium salts, which could be readily converted into 2-substituted pyrrolidine and indoline diamines.
Multinuclear Cu(I) Clusters Featuring a New Triply Bridging Coordination Mode of Phosphaamidinate Ligands
作者:Suresh C. Rathnayaka、Sergey V. Lindeman、Neal P. Mankad
DOI:10.1021/acs.inorgchem.8b01422
日期:2018.8.6
Phosphabenzamidine [mes-NH-C(Ph)═P-mes) (1) and phosphaformamidine (mes-NH-CH═P-mes) (4) ligands have been synthesized and characterized. The conjugate bases of 1 and 4 coordinate by each bridging three Cu(I) ions, forming hexa- and tetranuclear clusters Cu6[mes-N═C(Ph)-P-mes]3Cl4Li(THF)2 (3) and Cu4[mes-N═CH-P-mes]4 (5), respectively. Both clusters have been fully characterized using 1H NMR, 31P NMR
已经合成并表征了磷苯甲m [mes-NH-C(Ph)═P-mes)(1)和磷甲form(mes-NH-CH═P-mes)(4)配体。1和4的共轭碱基通过各自桥接三个Cu(I)离子进行配位,形成六核和四核簇Cu 6 [mes-N═C(Ph)-P-mes] 3 Cl 4 Li(THF)2(3)和Cu 4 [mes-N═CH-P-mes] 4(5)。使用1 H NMR,31 P NMR和X射线晶体学对两个簇进行了充分表征。配合物3和5表现出以前未知的磷酰胺的配位模式,远比其众所周知的a酰胺对应物研究少
Facile Synthesis of Phosphaamidines and Phosphaamidinates using Nitrilium Ions as an Imine Synthon
作者:Tom van Dijk、Sebastian Burck、Mark K. Rong、Amos J. Rosenthal、Martin Nieger、J. Chris Slootweg、Koop Lammertsma
DOI:10.1002/anie.201405027
日期:2014.8.18
Readily accessible nitrilium triflates are convenient imine building blocks for the expedient synthesis of a novel class of 1,3‐P,N ligands as demonstrated for the reaction with primary phosphanes. This procedure allows variation of all substituents. X‐ray crystal structures are reported for nitrilium ions, phosphaamidines, and three phosphaamidinate complexes. The lithium phosphaamidinate is N coordinated
Reactivity Study of Imino-<i>N</i>-Heterocyclic Carbene Palladium(II) Methyl Complexes
作者:Anna C. Badaj、Gino G. Lavoie
DOI:10.1021/om400533d
日期:2013.8.26
Neutral and cationic palladium(II) complexes containing three different heteroditopic bis(aryl)-substituted imino-N-heterocyclic carbene ligands have been synthesized and structurally characterized. Modifications made to the substituent at the iminic carbon allow for independent tuning of the steric and electronic environment around the metal center. The nature of this substituent profoundly affects