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.
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.
AEROBIC OXIDATIVE SYNTHESIS OF SULFONAMIDE USING Cu CATALYST
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Paragraph 0033-0037; 0039-0054; 0129-0131, (2021/04/06)
The present invention relates to a method for oxidative synthesis of sulfonamides using copper catalysts. , Oxygen (O) is used. 2 The oxidative synthesis of sulfonamides (1) comprises reacting a 2 th or sulfonyl hydrazide primary amine with a sulfonyl hydrazide (sulfonamide) with a copper catalyst on a solvent under the conditions in which the sulphonamide is fed. The oxidation coupling of the present invention showed extensive substrate ranges in an amine comprising a 2 primary amine, 1 primary amine and amine hydrochloride salt. It is worth notable that non-reactive aliphatic sulfonyl hydrazides in previously reported anaerobic systems can be used for the aerobic oxidation coupling of the present invention. The oxidation coupling of the present invention has been more effective on large scale.
