Anhydrous zirconium(IV) sulfate and tin(IV) sulfate: solid Lewis acid catalysts in liquid-phase hydro-acyloxy-addition reactions?
Literature Information
Ivo J. Dijs, Roene de Koning, John W. Geus, Leonardus W. Jenneskens
Anhydrous zirconium(IV) and tin(IV) sulfate [Zr(SO4)2 and Sn(SO4)2] were prepared from their corresponding metal tetrachlorides and fuming H2SO4/10% SO3. Properties of interest for their potential use as heterogeneous Lewis acid catalysts, such as their susceptibility to undergo hydrolysis, are studied. In the presence of water the metal sulfates are converted into their metal oxides (ZrO2 ·2H2O and SnO2·2H2O) and the Brønsted acid H2SO4, which can also be catalytically active. This is illustrated by the solvent-free liquid-phase hydro-acyloxy-addition of acetic acid (2) to camphene (1) (molar ratio 1: 2 = 1:1) giving the fragrance isobornyl acetate (3). Both anhydrous Zr(SO4)2 and Sn(SO4)2 are inactive as heterogeneous solid Lewis acid catalysts; no conversion of 1 into 3 is found. Upon addition of water, however, 1 is efficiently converted into 3. Moreover, the conversion of 1 into 3 continues even after removal of the solid Lewis acid catalyst by filtration. These results show that after addition of water the reaction becomes homogeneously catalysed by dissolved H2SO4.
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