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Substituted (pyridinyl)benzoazole palladium complexes: Synthesis and application as Heck coupling catalysts

S. O. Ojwach ; Gunnar Westman (Institutionen för kemi- och bioteknik, Organisk kemi) ; J. Darkwa
Polyhedron (0277-5387). Vol. 26 (2007), 18, p. 5544-5552.
[Artikel, refereegranskad vetenskaplig]

The synthesis of 2-(4-tert-butylpyridin-2-yl)-benzooxazole (L3), 2-(4-tert-butyl-pyridin-2-yl)-benzothiazole (L4) and 6-tert-Butyl-2(4-tert-butyl-pyridin-2-yl)-benzothiazole (L5) by intramolecular cyclization under basic conditions is described. Reactions of 2-pyridin-2-yl-1H-benzoimidazole (L2), 2-pyridin-2-yl-benzothiazole (L2) and L3-L5 with either [Pd(NCMe)(2)Cl-2)] or [Pd(COD)MeCl] afforded the corresponding mononuclear palladium complexes [Pd(L1)MeCl] (1), [Pd(L2)MeCl] (2), [Pd(L3)Cl-2] (3), [Pd(L3)MeCl] (4), [Pd(L4)Cl-2] (5), [Pd(L4)MeCl] (6) and [Pd(L4)MeCl] (7) as confirmed by mass spectrometry and elemental analyses. The palladium complexes are efficient Heck coupling catalysts for the reaction of iodobenzene with butylacrylate under mild conditions. Benzothiazole and benzooxazole containing complexes show faster induction periods compared to the benzoimidazole analogues. (C) 2007 Elsevier Ltd. All rights reserved.

Nyckelord: benzoazoles ligands, palladium complexes, catalysts, Heck coupling, reactions, PYRIDINE LIGANDS, POLYMERIZATION, ARYLATION, EFFICIENT, ETHYLENE, AGENTS



Denna post skapades 2008-12-10. Senast ändrad 2016-02-01.
CPL Pubid: 80901

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Organisk kemi (2006-2014)

Ämnesområden

Kemi

Chalmers infrastruktur