Accelerating the "On Water" Reaction: By Organic-Water Interface or By Hydrodynamic Effects?
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AbstractA series of organic reactions proceed dramatically faster in a heterogeneous mixture of the reactants and water than in a homogeneous mixture. Currently it is unclear whether the rate acceleration is due to the free OH groups at the organic water interface, or due to the hydrodynamic effects caused by vigorous stirring, vortexing, or ultrasonication. Herein we produced static droplets in microfluidic devices to answer this question. In the work, a series of organic droplets containing diethyl azodicarboxylate (DEAD) and quadricyclane surrounded by water were produced, which were transferred to and confined in glass capillaries to minimize the hydrodynamic effects. The cydoaddition process of DEAD with quadricydane was recorded by a CCD camera. The results showed the reaction proceeded in three steps, and the organic water interface alone was catalytically efficient enough to enhance the reaction rate to the same level as in the bulk emulsion reaction, indicating that the hydrodynamic effects were negligible.
All Author(s) ListGuo DM, Zhu DY, Zhou XH, Zheng B
Journal nameLangmuir
Year2015
Month12
Day29
Volume Number31
Issue Number51
PublisherAMER CHEMICAL SOC
Pages13759 - 13763
ISSN0743-7463
eISSN1520-5827
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry; Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science; Materials Science, Multidisciplinary

Last updated on 2020-13-10 at 02:18