Dimerization of Aryl Sulfonates by in situ Generated Nickel(0)
摘要:
A mild and user-friendly nickel-catalyzed method for the reductive homocoupling of aromatic tosylates is presented. The reaction proceeds between room temperature and 60 degrees C, with stable substrates (ArOTs) easily prepared from inexpensive and commercially available phenols or naphthols. It relies on a catalytic amount (10 mol%) of a robust catalyst (NiBr(2)bipy) that does not require the preparation of sensitive organometallic intermediates. Yields are good to excellent.
作者:D. G. Yakhvarov、Yu. H. Budnikova、D. I. Tazeev、O. G. Sinyashin
DOI:10.1023/a:1021611926712
日期:——
The material of the sacrificial anode has a substantial effect on the nature and yield of the target products of electrochemical phosphorylation of organic halides by white phosphorus in the presence of the nickel complexes with 2,2'-bipyridine. The use of the zinc anode results in the products with tricoordinated phosphorus, viz., triorganylphosphines, the reaction on the aluminum anode affords triorganylphosphine oxides, and the presence of Mg2+ ions in the reaction mixture provides the transformation of white phosphorus into cyclic phosphines (PhP)(5).
Nickel-catalysed electrochemical carboxylation of allylic acetates and carbonates
作者:M.J. Medeiros、C. Pintaric、S. Olivero、E. Dunach
DOI:10.1016/j.electacta.2010.12.066
日期:2011.4
The electrochemical carboxylation of a series of allylic acetates and carbonates was carried out in the presence of CO(2) under atmospheric pressure, with a catalytic amount of nickel-bipyridine complex, to afford the corresponding beta,gamma-unsaturated carboxylic acids. In the absence of nickel catalyst, alcohols were obtained. (C) 2011 Elsevier Ltd. All rights reserved.