[reaction: see text] A gold(I) complex of Xantphos AuCl(xantphos) catalyzes the dehydrogenativesilylation of alcohols with high chemoselectivity and solvent tolerance. It is selective for the silylation of hydroxyl groups in the presence of alkenes, alkynes, alkyl halides (RCl, RBr), ketones, aldehydes, conjugated enones, esters, and carbamates.
Selective alkyl ether cleavage by cationic bis(phosphine)iridium complexes
作者:Caleb A. H. Jones、Nathan D. Schley
DOI:10.1039/c8ob02298d
日期:——
conversion of alkyl ethers to silylethers via C–O bond cleavage. The previously-reported cationic pincer-supported iridium complex for this transformation suffers from poor selectivity with regard to monodealkylation of substrate ethers. We demonstrate that a simple non-pincer iridium complex offers improved selectivity and is capable of benzylic ether cleavage in the presence of reductively-labile
Light-Promoted Transfer of an Iridium Hydride in Alkyl Ether Cleavage
作者:Caleb D. Fast、Nathan D. Schley
DOI:10.1021/acs.organomet.1c00391
日期:2021.10.11
A catalytic, light-promoted hydrosilylative cleavage reaction of alkylethers is reported. Initial studies are consistent with a mechanism involving heterolytic silane activation followed by delivery of a photohydride equivalent to a silyloxonium ion generated in situ. The catalyst resting state is a mixture of Cp*Ir(ppy)H (ppy = 2-phenylpyridine-κC,N) and a related hydride-bridged dimer. Trends in