Surveying the {AuCl} adducts of bulky phosphines bearing the 2,6-dimesitylphenyl group

A series of gold chloride {AuCl} adducts of the sterically demanding phosphines DmpPR2 (Dmp = 2,6-dimesitylphenyl; R = H (1); Me (2); Cl (3)) have been prepared. The adducts are readily formed by the reaction of Au(tht)Cl and DmpPR2, yielding [(DmpPR2)AuCl] (R = H (4); Me (5); Cl (6)) in moderate to excellent yields. All three new compounds have been structurally characterized. The structures demonstrate little or no significant intermolecular Au⋯Au or intramolecular Au⋯arene interactions. In addition, the new difluoroarylphosphine DmpPF2 (7) has been prepared and structurally characterized.

Structural data for three [(DmpPR2)AuCl] complexes (R = H, Me, Cl) allow for an assessment of possible steric clashes between the bulkyl aryl group Dmp relative to possible attractive forces between the gold center and the electron rich mesityl rings.Figure optionsDownload as PowerPoint slide