Physical Organic Chemistry of Transition Metal Carbene Complexes. 17. 1 Kinetics of the Reactions of (Arylthioalkoxycarbene)pentacarbonyl Complexes of Chromium(0) and Tungsten(0) with Thiolate Ions in Aqueous Acetonitrile:  p K a Values of the Metal-Protonated Tetrahedral Adducts Formed between Carbene Complexes and Thiolate Ion [ J. Am. Chem. Soc. 1999 , 121 , 11384−11394].