Base-free oxidation of alcohols enabled by nickel(<scp>ii</scp>)-catalyzed transfer dehydrogenation
作者:Danfeng Ye、Zhiyuan Liu、Jonathan L. Sessler、Chuanhu Lei
DOI:10.1039/d0cc03966g
日期:——
An efficient nickel(II)-catalyzed transfer dehydrogenation oxidation of alcohols is reported that relies on cyclohexanone as the formal oxidant and does not require the use of an external base. The synthetic utility of this protocol is demonstrated via the facile oxidation of structurally complicated natural products.
Reaktionen von Ph2SbH und p-TolSbH2 mit organischen Verbindungen
作者:H.J. Breunig、J. Probst
DOI:10.1016/s0022-328x(98)00911-5
日期:1998.12
p-TolSbH2 reacts with styrene with formation of ethylbenzene and (p-TolSb)n (n=4, 5 in benzene). The action of phenyl acetylene on p-TolSbH2 gives styrene. Addition of Ph2SbH on phenyl acetylene in the presence of AIBN (azodiisobutyronitrile) yields 95% trans- and 5% cis-PhCHCHSbPh2. Ph2SbH reacts with benzaldehyde in the presence of AIBN with formation of benzylalcohol (98%) and with various prochiral
Dinitrogen oxide was employed as a clean oxidant for various oxidations in the presence of a catalytic amount of dioxoruthenium tetramesitylporphyrin complex (Ru(tmo)(O) 2 ). A variety of olefins, secondary alcohols, and benzyl alcohols were smoothly oxidized to the corresponding epoxides, ketones, and aldehydes in high yields. In the oxidation of 9,10-dihydroanthracene derivatives, the competitive
Acceptorless Dehydrogenation of <i>N</i>-Heterocycles and Secondary Alcohols by Ru(II)-NNC Complexes Bearing a Pyrazoyl-indolyl-pyridine Ligand
作者:Qingfu Wang、Huining Chai、Zhengkun Yu
DOI:10.1021/acs.organomet.7b00902
日期:2018.2.26
Ruthenium(II) hydride complexes bearing a pyrazolyl-(2-indol-1-yl)-pyridine ligand were synthesized and structurally characterized by NMR analysis and X-ray single crystal crystallographic determinations. These complexes efficiently catalyzed acceptorless dehydrogenation of N-heterocycles and secondary alcohols, respectively, exhibiting highly catalytic activity with a broad substrate scope. The present
Phosphine Effects in the Copper(I) Hydride-Catalyzed Hydrogenation of Ketones and Regioselective 1,2-Reduction of α,β-Unsaturated Ketones and Aldehydes. Hydrogenation of Decalin and Steroidal Ketones and Enones
作者:Jian-Xin Chen、John F. Daeuble、Jeffrey M. Stryker
DOI:10.1016/s0040-4020(00)00133-2
日期:2000.4
The stereoselectivity and regioselectivity of the catalytic hydrogenation of ketones and α,β-unsaturated ketones and aldehydes using soluble copper(I) hydride catalysts have been investigated as a function of the ancillary phosphine ligand. While a relatively narrow range of aryldialkylphosphine ligands produce active hydrogenation catalysts, some ligands provide higher selectivity for 1,2-reduction