Abstract
The bimolecular rate constants for tritium exchange between C 6H 13N ▪ 2 and (C 6H 5) 2PH and between C 6H 13N ▪ 2 and (C 6H 5) 2PD in CH 3CN solution were measured. The HT/DT kinetic isotope effects for forward and backward exchange at the region 250–323K were estimated. The rate constants for deuterium exchange between reagents in C 6H 6, (CH 2) 4O, C 5H 5N and CH 3CN solutions were determined. The reaction occurs probably via i) desolvation of hexylamine molecules and ii) double hydrogen transfer in a four-center cyclic complex. Tis transfer is a rate limiting step and significant contribution of tunneling does not occur.
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