Y. Toyoshi et al., SOLID-SOLID CATALYSIS BY ULTRAFINE CRYSTALLITES OF HETEROPOLY COMPOUND FOR PINACOL REARRANGEMENT, Chemistry Letters, (2), 1998, pp. 135-136
Cs2.5H0.5PW12O40 consisting of ultrafine crystallites efficiently cata
lyzes pinacol rearrangement of 1,1,2-triphenyl-1,2-ethanediol at room
temperature in solid-solid reaction system, giving the corresponding a
ldehyde selectively, while p-toluenesulfonic acid, H-ZSM-5, HY, SiO2-A
l2O3, SO42-/ZrO2 and Nb2O5 . nH(2)O were inactive. The activity of Cs2
.5H0.5PW12O40 in the solid-solid reaction was higher than that in soli
d-liquid (CHCl3) system.