ligand-free MnO2 mediated sequentialoxidation and olefination has been developed for the facile synthesis of a broad range of unsaturated N-heteroazaarenes from simple alkyl-substituted heteroarenes and alcohols. The procedure tolerates a series of functional groups, such as methoxyl, chloro, bromo, iodo, vinyl, phenolic and hetero groups, providing the olefination products in moderate to good yields
Nickel-catalysed direct α-olefination of alkyl substituted N-heteroarenes with alcohols
作者:Jagadish Das、Mari Vellakkaran、Debasis Banerjee
DOI:10.1039/c9cc03591e
日期:——
dehydrogenative coupling is presented. A simple nickel catalyst system stabilised by readily available nitrogen ligands enables a series of interesting E-configured vinylarenes (confirmed by X-ray crystal-structureanalysis) to be synthesised in good to excellent yields with olefin/alkane selectivity of >20 : 1. Hydrogen and water are generated as byproducts and quantitative determination of H2 was performed
α-olefination of methyl-substituted N-heteroarenes with primary alcohols. The catalytic dehydrogenative coupling enables a series of functionalized E-olefinated N-heteroaromatics with excellent selectivity (>99%). Initial mechanistic studies including deuterium-labeling experiments provide evidence for the participation of the benzylic C-H/D bond of alcohols.
A newseries of electroluminescent organiccompounds, 2,5-distyrylpyrazine derivatives, were prepared and investigated on EL properties. The high brightness was achieved in some of these compounds at a low dc voltage of about 10 V.
制备了一系列新的电致发光有机化合物 2,5-二苯乙烯基吡嗪衍生物并研究了 EL 特性。其中一些化合物在约 10 V 的低直流电压下实现了高亮度。
Control of Relative Direction and Amplitude in Extension/Contraction Motions of Molecular Strands Induced by Ion Binding
conformations of the subunits, thus inducingrelativemotions of strand domains either in the same (con‐sense, “twirling”) or in opposite (dis‐sense, “flapping”) directions. The amplitude of the motion induced by metal‐ionbinding and release and the relative directions of the formal motions can be controlled by the nature of the heterocyclic units. Thus, motions around a central 4,6‐disubstituted pyrimidine