Sym- collidinium chlorochromate (S-COCC), is a new, rapid and useful reagent for the oxidative deprotection
of oximes to the corresponding carbonyl compounds. The interesting feature of this catalytic system is that oximes which
have conjugated C=C bonds, the C=N bond will selectively convert to the relevant C=O bond. The reactions proceed under
room temperature, ethylacetate as solvent and in the presence of catalytic amount of aluminum chloride to offer the
products in excellent yields. Furthermore, in this study, it is indicated that both oximes with electron-withdrawing groups
and oximes with electron-donating groups produced carbonyl compounds in good yields. In this protocol, the deprotection
of oximes is less dependent on the electronic property of substrates. A theoretical study of NMR shielding tensors and
thermochemical parameters of substrates has also been carried out.
Keywords: Sym- collidinium chlorochromate (S-COCC), selective oxidative deprotection, room temperature, theoretical study,
NMR shielding tensors, thermochemical parameters.
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