Ethanediol, model structure

Fig. 2.21. Successive models of the transition structures for Sharpless epoxidation (a) the hexacoordinate Ti core with hydroxide and hydroperoxide ligand and a coordinated alkene (b) Ti with methylhydroperoxide, allyl alcohol, and ethanediol as ligands (c) monomeric catalytic center incorporating f-butylhydroperoxide as oxidant (d) monomeric catalytic center with formyl groups added (e) representation of the active dimeric catalyst. Reproduced from J. Am. Chem. Soc., 117, 11327 (1995), by permission of the American Chemical Society.

The classical and perhaps the most widely accepted picture of RMs seems to be that of Zensli who describes the water in the interior water-pool of microemulsions using a two-state model.A very viscous water, close to the interface, would be in equilibrium with that in the center of the pool, which exhibits properties similar to bulk water. FTIR and H NMR studies of the AOT reversed micellar-solubilization of pure and aqueous 1,2-ethanediol (ED and ED-W) as well as 1,2,3-propanetriol (PT and PT-W) show that the reversed-micellar-solubilized ED or ED-W as well as PT or PT-W molecules do not seem to coexist in layers of different structures as suggested by the multistate water solubilization micellar model. 

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