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NMR spectroscopy is an excellent tool for monitoring in-situ chemicalreactions. In particular, DOSY measurement is well suited to characterizetransient species by the determination of their sizes. However, here we bringto light a difficulty in the DOSY experiments performed in out-of-equilibriumsystems. On such a system, the evolution of the concentration of speciesinterferes with the measurement process, and creates a bias on the diffusioncoefficient determination that may lead to erroneous interpretations.  We show that a random permutation of the series of gradient strengths usedduring the DOSY experiment allows to average out this bias. This approach, thatwe name p-DOSY does not require changes in the the pulse sequences nor in theprocessing software, and restores completely the full accuracy of the measure.This technique is demonstrated on the monitoring of the anomerization reactionof \alpha- to \beta-glucose.

Accurate DOSY measure of out-of-equilibrium systems by permutated DOSY (p-DOSY)