Abstract
Imidazolinium salts 7,9-bis(2,4,6-trimethylphenyl)-6b,9a-dihydroacenaphtho[1,2-d]imidazolinium tetrafluoroborate and 7,9-bis(2,6-diisopropylphenyl)-6b,9a-dihydroacenaphtho[1,2-d]imidazolinium tetrafluoroborate, designated as [(BIAN-SIMes)(H)]BF4 (3a) and [(BIAN-SIPr)(H)]BF4 (3b), respectively, have been prepared and structurally characterized. The molecular structure of 3a shows the presence of a bifurcated hydrogen bond between the tetrafluoroborate anions and the central imidazolinium proton (−NCHN−). The palladium(II) complexes (η3-C3H5)Pd(BIAN-SIMes)Cl (5a) and (η3-C3H5)Pd(BIAN-SIPr)Cl (5b) have been synthesized. The temperature-dependent NMR behavior of σ-bonded palladium(II) complex 5b was studied. The crystal structure of 5b shows a localized single and double bond between the allyl ligand. The catalytic activities of the palladium(II) complexes 5a and 5b have been evaluated for Suzuki-type C−C coupling and for room-temperature C−N bond formation using aryl halides.
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