C-C coupling reactions of aryl bromides and arylsiloxanes in water catalyzed by palladium complexes of phosphanes modified with crown ethers.
[reaction: see text] The complexes [PdCl2L2], where L is a crown-ether-containing triarylphosphane, catalyze the formation of biaryls from arylsiloxanes and aryl bromides with high yields in water as solvent and under air. The water-insoluble catalysts [PdCl2(PhCN)2] and [PdCl2(PPh3)2] are also efficient, although they decompose more quickly to form black Pd0.
Gordillo
Alvaro
A
Departamento de Química Organica and Departamento de Química Inorganica, Universidad de Alcala, 28871 Alcala de Henares (Madrid), Spain.
de Jesús
Ernesto
E
López-Mardomingo
Carmen
C