Cyclometalated gold(iii) complexes for chemoselective cysteine modification via ligand controlled C-S bond-forming reductive eliminationElectronic supplementary information (ESI) available: Experimental procedures for preparation of cyclometalated gold(iii) complexes, modification of peptides, model studies, structural studies of gold-cysteine adducts, time course experiments, NMR spectra of gold(iii) complexes and reductive elimination products, LC-MS/MS analyses of gold-peptide adducts and S-a

Modular assembly of cyclometalated gold( iii ) complexes by choosing appropriate bidentate C,N-donor ligands and ancillary ligands for chemoselective cysteine modification of peptides and proteins via C-S bond-forming reductive elimination has been achieved. Modular assembly of cyclometalated gold( iii ) complexes by choosing appropriate bidentate C,N-donor ligands and ancillary ligands for chemoselective cysteine modification of peptides and proteins via C-S bond-forming reductive elimination has been achieved.