Novel N-bonded imidato complexes of general formula [Pd(N–N)(C6F5)(imidate)]
(imidate = maleimidate, succinimidate or phthalimidate; N–N = 2,2′-bipyridine (bipy), 4,4′-dimethyl-2,2′-bipyridine (Me2bipy) or N,N,N′,N′-tetramethylethylenediamine (tmeda)), [NBu4][Pd(C6F5)(H2O)(succinimidate)2] and [NBu4][Pd(C6F5)(L)(succinimidate)2]
(L = PPh3 or t-BuNC) have been synthesised. These complexes are air-, light- and moisture-stable. The crystal structures of [Pd(tmeda)(C6F5)(maleimidate)]·H2O·0.5CHCl3, [NBu4][Pd(C6F5)(H2O)(succinimidate)2]·H2O and [NBu4][Pd(C6F5)(t-BuNC)(succinimidate)2]·2H2O have been determined by X-ray diffraction. Many of these new complexes are shown to be active phosphine-free palladium catalysts/precatalysts for the Suzuki cross-coupling reactions of aryl bromides and aryl chlorides with phenylboronic acid.
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