A new application of (polyfluoroorgano)trifluoroborate salts: The palladium-catalysed cross-coupling reaction with substituted benzenediazonium tetrafluoroborates

Abstract

For the first time (polyfluoroorgano)trifluoroborate salts, namely K[C6F5BF3], K[C6HF4BF3] (all three isomers), K[3,4,5-C6H2F3BF3], and K[CF2=CFBF3] were principally applied as reagents to Pd-catalysed cross-coupling reactions. A series of polyfluorinated biphenyls (polyfluorophenyl)trifluoroborate salts on the reactivity in the coupling reaction was elucidated. In addition to (polyfluorophenyl)trifluoroborate salts, the cross-coupling was expanded to a first example of a perfluoroalkenyl reagent. K[CF2=CFBF3] reacted with [4-FC6H4N2][BF4] and formed CF2=CF-C6H4F-4. © 2002 Elsevier Science B.V. All rights reserved.