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Performance-enhancing ligands: Two new bridged bicyclic phosphines 1 a,b based on the “phoban” skeleton (see structures of their naphth-2-ylmethyl bromide salts; P yellow, Br brown, C white) are central to a practical catalytic method for the direct arylation of a variety of nitrogen heterocycles using aryl bromides. Broad functional-group tolerance was observed, and the use of microwave radiation allowed for short reaction times.
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Lewis et al. (2006) studied this question.
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