Reactivity of an Oxalamide-Based N-Heterocyclic Carbene
作者:Markus Braun、Walter Frank、Christian Ganter
DOI:10.1021/om201235c
日期:2012.3.12
electronic parameter of 2068 cm–1 was calculated for the diamidocarbene 2, which characterizes this ligand as the least electron donating NHC known so far. The dimerization product of carbene 2, the intensly fluorescing tetraamido ethylene 3, showed an unexpected chemical stability. Treatment of the chloro compound 1a with methanol afforded the methoxide 5a, whose structure was determined by X-ray
A closer look at the reactivity between N-heterocyclic carbenes and fluoroalkenes
作者:Matthew C. Leclerc、Jason G. Da Gama、Bulat M. Gabidullin、R. Tom Baker
DOI:10.1016/j.jfluchem.2017.05.012
日期:2017.11
total of 15 N-heterocyclic carbenes (NHCs) with various electronic and steric environments. The activity of these carbenes towards tetrafluoroethylene (TFE), hexafluoropropene (HFP), trifluoroethylene (HTFE) and vinylidene fluoride (VDF) is assessed in THF and toluene. Attempts were made to correlate the observed reactivity with electronic (Tolman Electronic Parameters) and steric (% buried volume) parameters
Phosphaalkene vs. phosphinidene: the nature of the P–C bond in carbonyl-decorated carbene → PPh adducts
作者:Roberta R. Rodrigues、Christopher L. Dorsey、Chelsee A. Arceneaux、Todd W. Hudnall
DOI:10.1039/c3cc45134h
日期:——
Treatment of dichlorophenylphosphine with two equivalents of carbonyl-decorated carbenes results in a two-electron reduction of the phosphorus centre concomitant with carbene oxidation to afford novel phosphaalkenes as confirmed via crystallographic, spectroscopic, and DFT analyses.
An N-Heterocyclic Carbene Ligand with an Oxalamide Backbone
作者:Markus Braun、Walter Frank、Guido J. Reiss、Christian Ganter
DOI:10.1021/om100728n
日期:2010.10.25
The preparation of the novel N-heterocyclic carbene ligand 3 based on an oxalamide backbone is described. Carbene 3 is not stable as a monomeric species at ambient temperature but dimerizes to the olefin 4 in the absence of trapping reagents. Carbene 3 reacts with elemental sulfur, tert-butylisocyanide, or [M(COD)Cl]2 (M = Rh, Ir) to give thione 5, ketenimine 6, or complexes [(3)M(COD)Cl] (7), respectively