Rates of chelate ring closure and opening at a chromium(III)–thiol bond
Abstract
The rates of chelate ring opening, (70[H+]+0·6)× 10–6[Cr(H2O)4(SCH2CO2)+], and closure, (70 + 0·8[H+]–1)× 10–7[Cr(H2O)5(O2CCH2SH)2+], at the Cr–S bond appear to parallel other substitutions at CrIII with no apparent abnormalities associated with the mercaptan function and a 100-fold rate advantage for chelate closure by both paths.