Tris(2,4,6-trifluorophenyl)borane: An Efficient Hydroboration Catalyst
作者:James R. Lawson、Lewis C. Wilkins、Rebecca L. Melen
DOI:10.1002/chem.201703109
日期:2017.8.16
The metal‐free catalyst tris(2,4,6‐trifluorophenyl)borane has demonstrated its extensive applications in the 1,2‐hydroboration of numerous unsaturated reagents, namely alkynes, aldehydes and imines, consisting of a wide array of electron‐withdrawing and donating functionalities. A range of over 50 borylated products are reported, with many reactions proceeding with low catalyst loading under ambient
Certain complexes containing ligands having a phosphino group, amino group or an imino group, and a second functional group such as amide, ester or ketone, when complexed to transition metals, catalyze the (co)polymerization of olefinic compounds such as ethylene, &agr;-olefins and/or acrylates. A newly recognized class of ligands for making copolymer containing polar monomers using late transition metal complexes is described.
Role of imine isomerization in the stereocontrol of the Staudinger reaction between ketenes and imines
作者:Fernando P. Cossío、Abel de Cózar、Miguel A. Sierra、Luis Casarrubios、Jaime G. Muntaner、Bimal K. Banik、Debasish Bandyopadhyay
DOI:10.1039/d1ra06114c
日期:——
allowed determining that the stereochemistry of the Staudinger reaction between ketenes and imines is strongly associated with the nature of the imine, which affects the two steps of the reaction. The first step, namely the nucleophilic attack of the sp2-hybridized nitrogen atom of the imine on the sp-hybridized carbon atom of the ketene, is affected by the energetically accessible in situ isomerization