Metathesis of C5–C8 Terminal Olefins on Re2O7/Al2O3 Catalysts
作者:Leonid M. Kustov、Daniil B. Furman、Aleksandra P. Barkova
DOI:10.1007/s10562-016-1698-5
日期:2016.6
Primary products of the interaction of terminalolefins C5–C8 with Re2O7/Al2O3 catalysts are established. The rupture of the C=C bond of the olefin occurs with formation of a carbene localized at a rhenium ion, with the alkylidene fragment in the produced carbene being the CH2=group of the terminal alkene molecule. Thus M=CH2 species and lower normal α-olefins are formed.Graphical Abstract
Mild and Selective H/D Exchange at the β Position of Aromatic α-Olefins by N-Heterocyclic Carbene-Hydride-Rhodium Catalysts
作者:Andrea Di Giuseppe、Ricardo Castarlenas、Jesús J. Pérez-Torrente、Fernando J. Lahoz、Victor Polo、Luis A. Oro
DOI:10.1002/anie.201007238
日期:2011.4.18
Pacman bites selectively! Stable rhodium(III)–N‐heterocyclic carbene–hydride complexes (Pacman‐like catalysts) are highly active and selective catalysts for H/D exchange at the β position of aromatic α‐olefins (see picture). The interplay between bulky N‐heterocycliccarbene and quinolinate ligands determines the size of the steric window responsible for this selectivity.