Characterization of nonderivatized plant cell walls using high-resolution solution-state NMR spectroscopy
作者:Daniel J. Yelle、John Ralph、Charles R. Frihart
DOI:10.1002/mrc.2201
日期:2008.6
coherence) 1‐bond 13C1H correlation spectroscopy, on nonderivatized cell wall material from a representative gymnosperm pinus taeda (loblolly pine), an angiosperm Populustremuloides (quakingaspen), and a herbaceous plant Hibiscus cannabinus (kenaf) demonstrate the efficacy of the system. We describe a method to synthesize 1‐methylimidazole‐d6 with a high degree of perdeuteration, thus allowing cell
Transition-Metal-Free Synthesis of Perdeuterated Imidazolium Ionic Liquids by Alkylation and H/D Exchange
作者:Ralf Giernoth、Dennis Bankmann
DOI:10.1002/ejoc.200700784
日期:2008.6
Economic, transition-metal-free syntheses of partially or completely deuterated imidazoliumionicliquids (ILs) were developed. Double alkylation starting from imidazole afforded side-chain deuterated imidazoliumionicliquids, which subsequently were fully deuterated by H/D-exchange on the cation ring. Isotopic exchange was studied for a range of ionicliquids, solvents and bases. Here, the presence
Transition-metal free ring deuteration of imidazolium ionic liquid cations
作者:Ralf Giernoth、Dennis Bankmann
DOI:10.1016/j.tetlet.2006.04.032
日期:2006.6
A simple, low-cost and transition-metal free ring deuteration procedure applicable to ionic liquids (ILs) with imidazolium cations has been developed. Reaction profiles for the exchange have been measured. (c) 2006 Elsevier Ltd. All rights reserved.
Reversible C−C Coupling in a Uranium Biheterocyclic Complex
作者:Marisa J. Monreal、Paula L. Diaconescu
DOI:10.1021/ja9109715
日期:2010.6.9
The C-C coupling of two molecules of 1-methylbenzimidazole was effected by a neutral uranium dibenzyl complex supported by a ferrocene 1,1'-diamide ligand. The transformation involves the C-H activation of two heterocycles and the coupling of one eta(2)-N,C-imidazolyl fragment with a coordinated 1-methylbenzimidazole ligand. The solid-state structure of this product was studied by both single-crystal and powder X-ray diffraction methods and confirms the formation of the biheterocyclic moiety. In solution, the C-C coupling event was found to be reversible, as assessed by variable-temperature H-1 and H-2 NMR spectroscopy as well as DFT calculations and reactivity studies.