presence of [HNEt3][HFe3(CO)11] as a water‐reduction catalyst (WRC) and triethylamine as a sacrificial reductant (SR), seven of the new iridium complexes showed activity. [Ir(6‐iPr‐bpy)(ppy)2]PF6 (bpy: 2,2′‐bipyridine, ppy: 2‐phenylpyridine) turned out to be the most efficient photosensitiser. This complex was also tested in combination with other WRCs based on rhodium, platinum, cobalt and manganese. In
cis-[Pt(R)2(DMSO)2] (R = Me, Ph) reacts with 6,6‘-diphenyl-2,2‘-bipyridine (H4L) in a 2:1 molar ratio, giving the unusual, very slightly soluble dinuclear complex [Pt2(L)(DMSO)2] (1). The reaction implies activation of four C−H bonds: in 1 a fourfold deprotonated H4L links two Pt−DMSO fragments acting as a delocalized C,N,C∧C,N,C 12-electron donor. From 1 more soluble dinuclear [Pt2(L)(L‘)2] (L‘ = bulky
Mechanistic insights into the potassium tert-butoxide-mediated synthesis of N-heterobiaryls
作者:David E. Stephens、Johant Lakey-Beitia、Jessica E. Burch、Hadi D. Arman、Oleg V. Larionov
DOI:10.1039/c6cc04816a
日期:——
We report herein that symmetrical and non-symmetrical N-heterobiaryls are produced by a potassium tert-butoxide-mediated dimerization of heterocyclic N-oxides. The reaction is scalable, transition metal-free, and can be carried out under...
The reaction of an alkyl- or aryl-lithium with 1,10-phenanthroline followed by hydrolysis and rearomatisation with manganese dioxide gives good yields of the 2,9-disubstituted product. This synthetic method has been extended to other polyimines such as 2,2′-bipyridine, 2,2′,6′, 2″-terpyridine and 1,8-naphtyridine.
The use of Ni(CO)2(PPh3)2 in aryl and pyridyl coupling reactions
作者:Nicholas E. Leadbeater、Sarah M. Resouly
DOI:10.1016/s0040-4039(99)00695-4
日期:1999.5
The zerovalentnickel complex Ni(CO)2(PPh3)2 has been used for the coupling of arylhalides to form biaryls and for the coupling of bromopyridines to form polypyridines. The effects of solvent, halide and substituents have also been investigated.