Ultra-small cobalt nanoparticles from molecularly-defined Co–salen complexes for catalytic synthesis of amines
作者:Thirusangumurugan Senthamarai、Vishwas G. Chandrashekhar、Manoj B. Gawande、Narayana V. Kalevaru、Radek Zbořil、Paul C. J. Kamer、Rajenahally V. Jagadeesh、Matthias Beller
DOI:10.1039/c9sc04963k
日期:——
situ generated cobalt nanoparticles from molecularly defined complexes as efficient and selective catalysts for reductive amination reactions. In the presence of ammonia and hydrogen, cobalt–salen complexes such as cobalt(II)–N,N′-bis(salicylidene)-1,2-phenylenediamine produce ultra-small (2–4 nm) cobalt-nanoparticles embedded in a carbon–nitrogen framework. The resulting materials constitute stable,
Titanium complexes supported by imidazo[1,5-a]pyridine-containing pyrrolyl ligand as catalysts for hydroamination and polymerization reactions, and as an antitumor reagent
The syntheses, structures, catalytic properties and antitumor activities of three titanium complexes supported by an imidazo[1,5-a]pyridine-containing pyrrolyl ligand are reported.
Chan–Evans–Lam Couplings with Copper Iminoarylsulfonate Complexes: Scope and Mechanism
作者:Valérie Hardouin Duparc、Guillaume L. Bano、Frank Schaper
DOI:10.1021/acscatal.8b01881
日期:2018.8.3
Copper(II) pyridyliminoarylsulfonate complexes with chloride or triflate counteranions were employed in Chan–Evans–Lam (CEL) couplings of N-nucleophiles and arylboronic acids. The complexes avoided typical side reactions in CEL couplings, and an excess of boronic acid was not required. Water was tolerated, and addition of neither base nor other additives was necessary. Primary amines, acyclic and cyclic
Anti-Markovnikov addition of anilines to aliphatic terminalalkynes proceeded using an 8-quinolinolato rhodium/phosphine catalyst system. The use of a strong organic base, 1,1,3,3,–tetramethylguanidine, in the catalyst system enabled the formation of the aldimine products. Substrates with various functional groups including polar groups such as a phenolic hydroxy group are applicable to the hydroamination
New, mild method for directed introduction of a fluorine atom into aromatic molecules
作者:Stojan Stavber、Iztok Košir、Marko Zupan
DOI:10.1039/c39920000274
日期:——
Hydroxyalkyl groups in various aromatic molecules are replaced with a fluorine atom by CsSO4F at room temperature thus regioselectively forming aryl fluorides in high to excellent yields.