[EN] PROCESS FOR THE PREPARATION OF OPTICALLY ACTIVE 1,2-DI(FURAN-2-YL)ETHANE-1,2-DIOLS AND DERIVATES THEREOF [FR] PROCÉDÉ DE PRÉPARATION DE 1,2-DI(FURAN-2-YL)ÉTHANE-1,2-DIOLS OPTIQUEMENT ACTIFS ET DÉRIVÉS DE CEUX-CI
with readily prepared cobalt or titanium nanoparticles, under mild reaction conditions, led to the obtention of different reductive dimerization products depending on the nature of the transition metal used. Cobalt nanoparticles (CoNPs) allowed the selective transformation of the starting carbonylcompounds into vicinal diols, whereas the reaction promoted by titanium nanoparticles (TiNPs) led to the
Truly Catalytic and Enantioselective Pinacol Coupling of Aryl Aldehydes Mediated by Chiral Ti(III) Complexes<sup>†</sup>
作者:A. Chatterjee、T. H. Bennur、N. N. Joshi
DOI:10.1021/jo0342875
日期:2003.7.1
A variety of chiral Ti(IV) complexes were reduced in situ with zinc in acetonitrile. The resulting chiral Ti(III) complexes were found to catalyze the pinacol coupling reaction stereoselectively. The best results were obtained from the Ti-SALEN complex, which was found to be an efficient catalyst at 10 mol % concentration. Various aromatic aldehydes were coupled to obtain chiral hydrobenzoin derivatives
Magnesium‐Induced Pinacol Coupling of Aromatic Aldehydes and Ketones Under Ultrasound Irradiation
作者:Jian‐Sen Wang、Ji‐Tai Li、Zhi‐Ping Lin、Tong‐Shuang Li
DOI:10.1081/scc-200057305
日期:2005.5.1
Abstract The system of magnesium and magnesiumiodide can reduce some aromatic aldehydes and ketones to the corresponding pinacols in good yields within 10–60 min at room temperature under ultrasound irradiation.
MeOH or H 2 O as efficient additive to switch the reactivity of allylSmBr towards carbonyl compounds
作者:Jianyong Li、Qingsheng Niu、Shanchan Li、Yuehao Sun、Qian Zhou、Xin Lv、Xiaoxia Wang
DOI:10.1016/j.tetlet.2017.01.091
日期:2017.3
aryl ketones mediated by Sm/alkyl halide/MeOH. The results demonstrate that the real reducing species in Sm/alkyl halide/MeOH system should be allylSmBr, and MeOH has elegantly switched the reactivity of allylSmBr from being nucleophilic to being good reductive coupling reagent. Besides, H2O was also found to be a useful additive to realize the pinacol coupling of aliphatic aldehydes and ketones promoted
First Pinacol Coupling in Emulsified Water: Key Role of Surfactant and Impact of Alternative Activation Technologies
作者:Muriel Billamboz、Christophe Len
DOI:10.1002/cssc.201500108
日期:2015.5.22
For the first time, the influence of surfactants on the radical pinacolcoupling reaction is investigated. The rate and selectivity of this reductive C‐C coupling are compared under three different activationtechnologies: thermal activation, microwave irradiation, and sonication. The use of IgepalCO520, a neutral surfactant, led to the successful conversion of aromatic or α,β‐unsaturated aliphatic