Abstract
The hydrogen-deuterium (H-D) exchange reaction between trimethylamine borane (TMAB) and deuterium oxide taken up by a sulfonate cation exchanger, Dowex 50-X2 in the D + form, was carried out in columns under dynamic conditions. A first pass of a 0.1 M solution of TMAB through a Dowex 50-X2 ion exchanger, swollen in D 2O, gives > 90% conversion into TMAB-d 3. A second pass of the enriched solution through a fresh resin produces 100% pure deuterated product zone. Kinetic studies of consequential deuteration of 0.1 M TMAB solutions in CCl 4 with Dowex 50-X2 in the D + form under batch conditions show that the effective rate of isotope exchange is directly proportional to the relative amount of D 2O in the resin phase.
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