Abstract
For the first time, an experimental evidence for the existence of a zwitterionic intermediate (ZI) on reaction mechanism of a synthesized phosphorous ylide has been presented in aqueous–organic solvent mixtures by using the stopped-flow technique. Spectral analyses confirmed the existence of ZI in the step 1 of the reaction. The step 1 that was recognized as a fast step included the formation and decay of the ZI. Pro-K analyzer detected six species according to the proposed mechanism. Also, the kinetics of the reaction has been studied by the UV–Vis spectrophotometer. The value of rate constants for the step 1 (k1 and k−1), step 2 (k2) and overall (kovr), and associated activation parameters of the reaction were determined. Copyright © 2015 John Wiley & Sons, Ltd.
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