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2005
Deprotection
O 0345
2,6-Dicarboxypyridinium Chlorochromate. An Efficient and Selective Reagent
the Mild Deprotection of Acetals, Thioacetals, and 1,1-Diacetates to Carbonyl
06- 066 for
Compounds. — The title oxidant is a mild and inexpensive reagent for the rapid conversion of aliphatic and aromatic acetals, ketals, and 1,1-diacetates to their corresponding carbonyl compounds. Unlike other methods, over-oxidation of the aldehydes into
carboxylic acids is not observed. Deprotection of thioacetals (III) requires a higher
amount of the oxidant, longer reaction times, and higher temperature. In addition, the
title oxidant selectively cleaves acetals or diacetates in the presence of thioacetals. —
(HOSSEINZADEH*, R.; TAJBAKHSH, M.; SHAKOORI, A.; NIAKI, M. Y.;
Monatsh. Chem. 135 (2004) 10, 1243-1249; Dep. Chem., Mazandaran Univ.,
Babolsar 47415, Iran; Eng.) — H. Hoennerscheid
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