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DOI: 10.1039/A706354G (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 791-796

Synthesis, structure and reactivity of a new six-membered cycloaurated complex of 2-benzoylpyridine [AuCl2(pcp-C[hair space][hair space] 1,N[hair space])] [pcp = 2-(2-pyridylcarbonyl)phenyl]. Comparison with the cycloaurated complex derived from 2-benzylpyridine

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Yoshio Fuchita, Hidenori Ieda, Yukiko Tsunemune, Junko Kinoshita-Nagaoka and Hiroyuki Kawano

Abstract

A six-membered cycloaurated complex [AuCl2(pcp-C1,N[hair space])] [pcp = 2-(2-pyridylcarbonyl)phenyl] has been prepared by the reaction between the adduct [AuCl3(Hpcp)] (Hpcp = 2-benzoylpyridine) and AgO2CCF3, and its structure determined by X-ray diffraction. The boat-like conformation of the six-membered pcp–Au ring has been compared to that of the pmp–Au ring in [AuCl(pmp-C1,N[hair space])(PPh3)]BF4 [pmp = 2-(2-pyridylmethyl)phenyl] the structure of which has also been established by X-ray diffraction. The complex [AuCl2(pcp-C1,N[hair space])] reacts with PPh3 in a 1∶1 molar ratio to give a neutral complex [AuCl2(pcp)(PPh3)]. This is further converted into trans-[AuCl(pcp)(PPh3)2]BF4 and [Au(pcp-C1,N[hair space])2]BF4 by treating with PPh3 in the presence of NaBF4 and excess of AgBF4, respectively. This reactivity towards triphenylphosphine has been compared with that of the known cycloaurated complex [AuCl2(pmp-C1,N[hair space])]. Temperature-dependent 1H NMR spectra attributable to inversion of the six-membered pmp–Au ring have been observed and the rates of inversion measured by line shape analysis of the methylene protons in [AuCl(pmp-C1,N[hair space])(PPh3)]BF4.

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