Abstract:The kinetics of the reaction of PhSnH with excess •Cr(CO)CMe = •Cr, producing HCr and PhSn-Cr, was studied in toluene solution under 2-3 atm CO pressure in the temperature range of 17-43.5 °C. It was found to obey the rate equation d[PhSn-Cr]/dt = k[PhSnH][•Cr] and exhibit a normal kinetic isotope effect (k/k = 1.12 ± 0.04). Variable-temperature studies yielded ΔH = 15.7 ± 1.5 kcal/mol and ΔS = -11 ± 5 cal/(mol·K) for the reaction. These data are interpreted in terms of a two-step mechanism involving a thermod… Show more
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