Synthesis of Chloroaurates and Phosphine Complexes

4-Diphenylphosphine benzoic acid and other chemicals were purchased from Merck and used without any other purifications. Chops of metal gold was purchased from Merck and used to synthesize tetrachloroauric acid by dissolving the gold chop by boiling aqua regia and by the careful evaporation of water till almost to dryness. Me₂SAuCl was prepared by the reduction of tetrachloroauric acid with an excess of Me₂S in ethanol. HPLC grade CH₂Cl₂ was dried over 3 Å molecular sieves purchased from Supelco before the use. The reactions were led under an inert atmosphere of nitrogen. Brookhart anion was freshly synthesized before its use according to the literature.⁴⁹ L^COOMe and L^COOEt were synthesized as previously described,^{32 (link)} the solvent-mediated preparations of L^COOHAuCl and (L^COOH)₂AuCl were previously reported in the literature by some of the authors.^{30 (link)}