Polyethylene glycol (PEG) is found to be an inexpensive and non-toxic reaction medium for the microwave-assisted Suzuki cross-coupling of arylboronic acids with aryl halides. This environmentally friendly microwave protocol offers ease of operation and enables recyclability of catalyst and synthesis of a variety of substituted biaryls employing palladium chloride as catalyst and potassium fluoride as the base.
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Namboodiri et al. (2001) studied this question.
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