J. Schulz, I. Císařová, P. Štěpnička
Jan 23, 2012
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Influential Citations
46
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Organometallics
Abstract
The reaction of pentafluorophenyl 1′-(diphenylphosphino)ferrocene-1-carboxylate (4) with ω-aminosulfonic acids H2N(CH2)nSO3H (n = 1–3) in the presence of 4-(dimethylamino)pyridine and triethylamine affords the respective phosphinoferrocene amidosulfonates as crystalline triethylammonium salts, viz., (Et3NH)[Ph2PfcCONH(CH2)nSO3] (1, n = 1; 2, n = 2; 3, n = 3; fc = ferrocene-1,1′-diyl), in good yields. These ligands react smoothly with [PdCl2(cod)] (cod = η2:η2-cycloocta-1,5-diene) to give the anionic square-planar bis-phosphine complexes trans-(Et3NH)2[PdCl2(Ph2PfcCONH(CH2)nSO3-κP)2] (5, n = 1; 6, n = 2; and 7, n = 3). The chloride-bridged dimer [LNCPdCl]2, where LNC is 2-[(dimethylamino-κN)methyl]phenyl-κC1 auxiliary ligand, is cleaved with 1 to give (Et3NH)[LNCPd(Ph2PfcCONHCH2SO3-κP)] (8), in which the amidosulfonate coordinates as a simple phosphine. A similar reaction of [LNCPd(OAc)]2 and 1 proceeds under a partial elimination of (Et3NH)OAc to afford a mixture of zwitterionic bis-chelate [LNCPd(Ph2PfcC...