Heteropoly Acids as Heterogeneous Catalysts for Thioacetalization and Transthioacetalization Reactions
Habib Firouzabadi*, Nasser Iranpoor*, Kamal Amani
*Department of Chemistry, Shiraz University, Shiraz 71454, Iran, Email: firouzabadichem.susc.ac.ir
H. Firouzabadi, N. Iranpoor, K. Amani, Synthesis, 2002, 59-60.
Tungstophosphoric acid (H3PW12O40) was found to be an effective and highly selective catalyst for the thioacetalization of aldehydes, ketones, acetals, acylals and O,S-acetals in excellent yields in the absence of solvent. Chemoselective conversions of α- or β-diketones and a β-keto ester are described. Sterically hindered carbonyl compounds were converted to the corresponding thioacetals in refluxing petroleum ether in good yields.
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