Tandem ammonia borane dehydrogenation/alkene hydrogenation mediated by [Pd(NHC)(PR<sub>3</sub>)] (NHC = N-heterocyclic carbene) catalysts
作者:Caroline E. Hartmann、Václav Jurčík、Olivier Songis、Catherine S. J. Cazin
DOI:10.1039/c2cc38145a
日期:——
[Pd(NHC)(PR3)] complexes were shown to be active catalysts in the dehydrogenation of ammonia borane and the subsequent hydrogenation of unsaturated compounds at very low catalyst loadings (0.05 mol% for some substrates).
Synthesis, Characterization, and Reactivity of N-Heterocyclic Carbene Palladium(II) Hydroxide Dimers
作者:Jonathan D. Egbert、Anthony Chartoire、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1021/om200579h
日期:2011.9.12
Palladium hydroxide dimers were prepared by reactions of CsOH with monomeric [Pd(NHC)(η3-allyl)Cl] starting materials. The dimers represent species proposed as intermediates in important cross-coupling reactions. These complexes were tested for their catalytic activity in Suzuki–Miyaura coupling and Buchwald–Hartwig aryl amination. The hydroxide complexes were susceptible to hydrogenolysis on exposure
Palladium(0) NHC complexes: a new avenue to highly efficient phosphorescence
作者:Adam F. Henwood、Mathieu Lesieur、Ashu K. Bansal、Vincent Lemaur、David Beljonne、David G. Thompson、Duncan Graham、Alexandra M. Z. Slawin、Ifor D. W. Samuel、Catherine S. J. Cazin、Eli Zysman-Colman
DOI:10.1039/c4sc03914a
日期:——
We report the first examples of highly luminescent di-coordinated Pd(0) complexes.
我们报道了高度发光的双配位Pd(0)配合物的首个实例。
The Isolation of [Pd{OC(O)H}(H)(NHC)(PR<sub>3</sub>)] (NHC = N-Heterocyclic Carbene) and Its Role in Alkene and Alkyne Reductions Using Formic Acid
作者:Julie Broggi、Václav Jurčík、Olivier Songis、Albert Poater、Luigi Cavallo、Alexandra M. Z. Slawin、Catherine S. J. Cazin
DOI:10.1021/ja311087c
日期:2013.3.27
The [Pd(SIPr)(PCy3)] complex efficiently promotes a tandem process involving dehydrogenation of formic acid and hydrogenation of C-C multiple bonds using H-2 formed in situ. The isolation of a key catalytic hydridoformatopalladium species, [PdOC(O)H}(H)(IPr)(PCy3)], is reported. The complex plays a key role in the Pd(0)-mediated formation of hydrogen from formic acid. Mechanistic and computational studies delineate the operational role of the palladium complex in this efficient tandem sequence.
作者:Václav Jurčík、Thibault E. Schmid、Quentin Dumont、Alexandra M. Z. Slawin、Catherine S. J. Cazin
DOI:10.1039/c2dt30133d
日期:——
[Pd(NHC)(PR3)] complexes quantitatively form [Pd(η2-O2)(NHC)(PR3)] products when submitted to an dioxygen atmosphere. Synthetic details and structural features of these Pd–peroxo complexes are described. The palladium compounds were found to be efficient catalysts in the oxidation of alcohols into corresponding carbonyl compounds using O2 or air as oxidant. Reactions proceed at low catalyst loadings