Fluorobenzene and 1,2-difluorobenzene are defluorinated under very mild conditions by H 2 (4 atm) at 70 °C in the presence of NaOAc. The heterogeneous catalysts for these reactions contain the rhodium pyridylphosphine ( 1 ) and bipyridyl ( 2 ) complexes [Rh(COD)( 1 )]BF 4 and [Rh(COD)( 2 )]BF 4 tethered to heterogeneous Pd−SiO 2 .
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Yang et al. (1999) studied this question.
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