Abstract
The electrochemical behavior of phenyl benzoate (PB) in the neutral AlCl3 : 1-ethyl-3-methylimidazolium chloride ionic liquid has been studied. Addition of HfCl4 to phenyl benzoate in this medium produces a positive potential shift for the phenyl benzoate reduction process. Heating the solution to 80oC for 30 hours gives 4-hydroxybenzophenone as the major product. Cyclic voltammetric studies show that HfCl4 reacts with the ionic liquid to produce relatively small amounts of Al2Cl7-, so that HfCl4 is still the principal Lewis acid in this system. Comparison studies using added AlCl3 in place of HfCl4 show similar behavior, with a somewhat different potential shift for the AlCl3 : PB interaction.
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