Na[AuCl 4 ] reacts with [py{SCH 2 C(O)R}-2] (py-2 = 2-pyridyl) at room temperature to give cyclometalated alkylgold(III) complexes [R = Ph ( 1a ), Me ( 1b ), OMe ( 1b )], which in turn react with NaBr or with PR‘ 3 in the presence of NaClO 4 to give [R = Ph ( 2a ), Me ( 2b )] or a mixture of SP4-3- and [R = Ph ( 3a ), Me ( 3b )]. This mixture of isomers converted to the isomer SP4-4 upon refluxing in chloroform. When the last reaction was made using P(C 6 H 4 OMe-4) 3, the main products were [AuCl{P(C 6 H 4 OMe-4) 3 }] and [Hpy{SCH 2 C(O)Ph}-2]ClO 4 . The crystal structure of the latter has been determined.
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Vicente et al. (1999) studied this question.