Catalytic carbonyl hydrosilylations via a titanocene borohydride–PMHS reagent system
作者:Godfred D. Fianu、Kyle C. Schipper、Robert A. Flowers II
DOI:10.1039/c7cy01088e
日期:——
Reduction of a wide range of aldehydes and ketones with catalytic amounts of titanocene borohydride in concert with a stoichiometric poly(methylhydrosiloxane) (PMHS) reductant is reported. Preliminary mechanistic studies demonstrate that the reaction is mediated by a reactive titanocene(III) complex, whose oxidation state remains constant throughout the reaction.
Electrochemistry Broadens the Scope of Flavin Photocatalysis: Photoelectrocatalytic Oxidation of Unactivated Alcohols
作者:Wen Zhang、Keith L. Carpenter、Song Lin
DOI:10.1002/anie.201910300
日期:2020.1.2
context of alcohol oxidation. However, to date, the scope of this catalytic methodology has been limited to benzyl alcohols. In this work, mechanistic understanding of flavin-catalyzed oxidationreactions, in either the absence or presence of thiourea as a cocatalyst, was obtained. The mechanistic insights enabled development of an electrochemically driven photochemical oxidation of primary and secondary
Hot water-promoted cyclopropylcarbinyl rearrangement facilitates construction of homoallylic alcohols
作者:Pei-Fang Li、Cheng-Bo Yi、Jin Qu
DOI:10.1039/c5ob00305a
日期:——
H2O–1,4-dioxane and without an additional catalyst, the rearrangements of various types of cyclopropylcarbinols were attempted. It was found that the reactions generally gave homoallylic alcohols in good to very high chemical yields. Rearrangements of bicyclic or tricyclic cyclopropylcarbinols readily gave the desired ring-expanded cyclic homoallylic alcohols which are difficult to synthesize by other
Indium Triflate Catalyzed Rearrangement of Aryl-Substituted Cyclopropyl Carbinols to 1,4-Disubstituted 1,3-Butadienes
作者:Brindaban C. Ranu、Subhash Banerjee
DOI:10.1002/ejoc.200600037
日期:2006.7
Aryl-substituted cyclopropyl carbinol derivatives undergo a facile stereoselective rearrangement catalyzed by In(OTf) 3 in dichloromethane under sonication to produce the substituted conjugated all-trans-butadienes.
Spectroscopic Characterization of (Iodomethyl)zinc Reagents Involved in Stereoselective Reactions: Spectroscopic Evidence That IZnCH<sub>2</sub>I Is Not Zn(CH<sub>2</sub>I)<sub>2</sub> + ZnI<sub>2</sub> in the Presence of an Ether
作者:André B. Charette、Jean-François Marcoux
DOI:10.1021/ja951171k
日期:1996.1.1
13C NMR spectroscopy is an extremely powerful technique for characterizing the (iodomethyl)zinc-derived reagents involved in the cyclopropanation reactions. This technique has allowed us to spectroscopically characterize and unambigously differentiate the Furukawa reagent (EtZnCH2I), the Simmons−Smith reagent (IZnCH2I), and the Wittig reagent (Zn(CH2I)2). Unique spectra are obtained for each of these