Aluminum dodecatungstophosphate

Eirouzabadi, H., Iranpoor, N., and Nowrouzi, E. 2003. Solvent-free Friedel-Crafts acylation of aromatic compounds with carboxylic acids in the presence of trifluoroacetic anhydride and aluminum dodecatungstophosphate. Tetrahedron Lett. 44 5343-5345. 

Firouzabadi and coworkers reported aluminum dodecatungstophosphate (AIPW12 O40) as a water tolerant, highly active, and reusable catalyst for the preparation of benzylic alkyl or symmetrical dibenzylic ethers from their corresponding alcohols (Scheme 6.7) [7a]. This heteropoly acid catalyst was also applied to the preparation of diphenylmethylsulfides from diphenylmethanol and a variety of thiols [7bj. 

Heteropoly acid, aluminum dodecatungstophosphate AIPW12O40, was found to be an effective catalyst for the Friedel-Crafts acylations using carboxylic acid, acetic anhydride, and benzoyl chloride (Scheme 6.9) [11]. Nonhydroscopic nature and relatively high catalytic activity of this heteropoly acid, for example, as compared with Sc(OTf)3 or In(OTf)3, should be noted. Reactions were conducted under solvent-free conditions. 

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