Cobalt-Catalyzed Acceptorless Dehydrogenative Coupling of Primary Alcohols to Esters
作者:Keshav Paudel、Bedraj Pandey、Shi Xu、Daniela K. Taylor、David L. Tyer、Claudia Lopez Torres、Sky Gallagher、Lin Kong、Keying Ding
DOI:10.1021/acs.orglett.8b01775
日期:2018.8.3
A novel catalytic system with a tripodal cobalt complex is developed for efficiently converting primaryalcohols to esters. KOtBu is found essential to the transformation. A preliminary mechanistic study suggests a plausible reaction route that involves an initial Co-catalyzed dehydrogenation of alcohol to aldehyde, followed by a Tishchenko-type pathway to ester mediated by KOtBu.
为了有效地将伯醇转化为酯,开发了具有三脚架钴络合物的新型催化体系。KO t Bu被发现对转型至关重要。初步的机理研究表明,可能的反应路线包括最初的共催化将醇脱氢成醛,然后由Tishchenko型途径由KO t Bu介导生成酯。
Mono(imidazolin-2-iminato) Actinide Complexes: Synthesis and Application in the Catalytic Dimerization of Aldehydes
作者:Isabell S. R. Karmel、Natalia Fridman、Matthias Tamm、Moris S. Eisen
DOI:10.1021/ja5091436
日期:2014.12.10
diffraction analysis. The mono(imidazolin-2-iminato) actinide complexes 3-8 display short An-N bonds together with large An-N-C angles, indicating strong electron donation from the imidazolin-2-iminato moiety to the metal, corroborating a substantial π-character to the An-N bond. The reactivity of complexes 3-8 toward benzaldehyde was studied in the catalytic dimerization of aldehydes (Tishchenko reaction)
Disodiumtetracarbonylferrate (–II) is an efficient catalyst for the dismutation of aromatic aldehydes to esters, 2RCHO→RCOOCH2R. Aliphatic ones give aldol-condensation products upon treatment with the ferrate. A successive reaction of the ferrate with an aldehyde, RCHO, and then with alkyl iodide, R’I, gives an ester, R’COOCH2R, after protonation. The mechanisms of these reactions are discussed.
Thorium complexes possessing expanded ring N-heterocyclic iminato ligands: synthesis and applications
作者:Tapas Ghatak、Shani Drucker、Natalia Fridman、Moris S. Eisen
DOI:10.1039/c7dt02126g
日期:——
Six and seven membered N-heterocyclic iminato ligands (L) are introduced allowing access a new class of Th(IV) complexes of the type Cp*2Th(L)(CH3). These complexes were studied in the Tishchenko reaction. Stoichiometric reactions together with kinetic and thermodynamic studies permit us to propose a plausible mechanism.
Synthesis, characterization and catalytic performances of benzimidazolin-2-iminato actinide (IV) complexes in the Tishchenko reactions for symmetrical and unsymmetrical esters
作者:Heng Liu、Maxim Khononov、Natalia Fridman、Matthias Tamm、Moris S. Eisen
DOI:10.1016/j.jorganchem.2017.09.020
日期:2018.2
benzimdazolin-2-iminato actinide−(IV) complexes [(Bim7-MeDipp/MeN)An(N(SiMe3)2)3] (An = U (3), Th (4)) and [(Bim4-MeDipp/MeN)An(N(SiMe3)2)3] (An = U (5), Th (6)) were synthesized and their solid state structures were established by single-crystal X-ray diffraction analysis. The catalytic performances of complexes 3–6 towards the homo- and cross-coupling of aldehydes (Tishchenko reaction) were studied and the thorium