A novel polymeric phosphotungstate catalyst bearing a poly(ethylene oxide-pyridinium) matrix was developed that efficiently promoted oxidation of a variety of alcohols, including highly sterically demanding neopentyl alcohols, with hydrogen peroxide, to afford the corresponding carbonyl compounds in up to quantitative yield. The chemoselective oxidation of sterically hindered secondary alcohols in the presence of primary alcohols was achieved. The catalyst could be reused four times without any loss of catalytic activity.

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Protection O 0345 Development of a Novel Method for the Preparation of Dithioacetal in the Presence of Titanium(IV) Chloride/Zinc in Dimethoxymethane.-A new synthetic method for the preparation of dithioacetals is developed, that is compatible with a variety of functional groups such as ether, ester and amino

A new method for deprotection of thioesters using TiCl 4 / Zn at 0-25°C is described. The procedure chemoselectively cleaves the S-CO bond in thioesters in the presence of other carbonyl functional groups and other protecting groups to cleanly produce thiols.