Synthesis of chromium N-heterocyclic carbene complexes using chromium Fischer carbenes as a source of chromium carbonyls
作者:Seongjin Kim、Soo Young Choi、Young Tak Lee、Kang Hyun Park、Helmut Sitzmann、Young Keun Chung
DOI:10.1016/j.jorganchem.2007.08.043
日期:2007.11
Chromium Fischer carbenecomplexes, [CrOMe(R)}(CO)5] have been utilized as a source of chromium carbonyls in the synthesis of chromium NHC complexes. Using the synthetic method, chromiumcomplexes of various NHC ligands were isolated in reasonable yields. Moreover, the method can be employed for the synthesis of molybdenum and tungsten NHC compounds.
Ternary systems of inorganic Pt salts and oxides, ionic liquids and concentrated sulfuric acid are effective at catalyzing the direct, selective oxidation of methane to methanol and appear to be more water tolerant than the Catalytica reaction.
Reactivity of Protons, Tertiary Stannanes, and Alkynes with a Triruthenium Dihydrido Cluster Containing a Face-Capping NHC Ligand
作者:Javier A. Cabeza、Ignacio del Río、José M. Fernández-Colinas、M. Gabriela Sánchez-Vega
DOI:10.1021/om8011129
日期:2009.2.23
of two or three molecules of the tertiary stannane and that contain an Me2Im ligand that is formed by coupling of the CH fragment of the MeImCH ligand of 1 with two hydrido ligands; and (c) with various alkynes to give mixtures of many products. A trinuclear cluster that only contains carbonyl groups and an intact face-capping MeImCH ligand has been isolated from the reaction of 1 with dimethyl acetylenedicarboxylate
Martin’s spirosilane with different types of N-heterocycliccarbenes (NHCs). The level of interaction proved to be strongly dependent on the size of the Lewis base and could vary from the formation of isolable classical Lewis adducts to abnormal Lewis adducts, as evidenced by X-ray diffraction structure analyses and NMR studies. It has been found that abnormal adducts could be used as precursors for the synthesis
N-Heterocyclic Carbene Boranes as Reactive Oxygen Species-Responsive Materials: Application to the Two-Photon Imaging of Hypochlorous Acid in Living Cells and Tissues
N‐Heterocyclic carbene (NHC) boranes undergo oxidative hydrolysis to give imidazolium salts with excellent kinetic selectivity for HOCl over other reactive oxygen species (ROS), including peroxides and peroxynitrite. Selectivity for HOCl results from the electrophilic oxidation mechanism of NHC boranes, which stands in contrast to the nucleophilic oxidation mechanism of arylboronic acids with ROS.