837-18-3Relevant articles and documents
A Strategy to Control the Reactivation of Frustrated Lewis Pairs from Shelf-Stable Carbene Borane Complexes
Hoshimoto, Yoichi,Kinoshita, Takuya,Ohashi, Masato,Ogoshi, Sensuke
, p. 11666 - 11671 (2015)
N-Phosphine oxide substituted imidazolylidenes (PoxIms) have been synthesized and fully characterized. These species can undergo significant changes to the spatial environment surrounding their carbene center through rotation of the phosphine oxide moiety. Either classical Lewis adducts (CLAs) or frustrated Lewis pairs (FLPs) are thus formed with B(C6F5)3 depending on the orientation of the phosphine oxide group. A strategy to reactivate FLPs from CLAs by exploiting molecular motions that are responsive to external stimuli has therefore been developed. The reactivation conditions were successfully controlled by tuning the strain in the PoxIm-B(C6F5)3 complexes so that reactivation only occurred above ambient temperature. Frustration under control: Imidazolylidenes with a phosphine oxide substituent on one of the nitrogen atoms can undergo drastic changes to the spatial environment surrounding their carbene center through rotation of the phosphine oxide moiety. Depending on the orientation of this group, either classical Lewis adducts or frustrated Lewis pairs (FLPs) are formed upon addition of B(C6F5)3.
Amide Iridium Complexes As Catalysts for Transfer Hydrogenation Reduction of N-sulfonylimine
Wen, Huiling,Luo, Nianhua,Zhu, Qianheng,Luo, Renshi
, p. 3850 - 3859 (2021/03/09)
Sulfonamide moieties widely exist in natural products, biologically active substance, and pharmaceuticals. Here, an efficient water-soluble amide iridium complexes-catalyzed transfer hydrogenation reduction of N-sulfonylimine is developed, which can be carried out under environmentally friendly conditions, affording a series of sulfonamide compounds in excellent yields (96-98%). In comparison with organic solvents, water is shown to be critical for a high catalytic transfer hydrogenation reduction in which the catalyst loading can be as low as 0.001 mol %. These amide iridium complexes are easy to synthesize, one structure of which was determined by single-crystal X-ray diffraction. This protocol gives an operationally simple, practical, and environmentally friendly strategy for synthesis of sulfonamide compounds.
Implication of a Silyl Cobalt Dihydride Complex as a Useful Catalyst for the Hydrosilylation of Imines
Barbazanges, Marion,Bories, Cassandre C.,Derat, Etienne,Petit, Marc
, p. 14262 - 14273 (2021/11/27)
Here, we describe the formation and use of silyl cobalt (III) dihydride complexes as powerful catalysts for the hydrosilylation of a variety of imines starting from a low-valent well-defined cobalt (I) complex. The reaction is efficient at low catalyst loadings with a diverse range of imines bearing various protecting groups, as well as aliphatic ketimines and quinoline. Kinetics, DFT calculations, NMR spectroscopic studies, deuteration experiments, and X-ray diffraction analyses allowed us to propose a catalytic cycle based on silyl dihydrocobalt (III) complexes performing a hydrocobaltation.
