Abstract
Solid-state catalysis has been studied by using various solid acids for pinacol rearrangement of l,l,2-triphenyl-l,2-ethanediol at room temperature. A mixture of the solid reactant and catalyst was ground for 5 min beforehand, at which the reaction did not proceed. While it was allowed to stand, the reaction proceeded on heteropoly compounds such as CS 2.5 H 0.5 PW 12 O 40 and H 3 PW 12 O 40 and polymer resins (Amberlyst 15 and Nafion/SiO 2 ), but did not on H-ZSM-5, SiO 2 -Al 2 O 3 , p-toluenesulfonic acid, etc. CS 2.5 H 0.5 PW 12 O 40 snowed the highest activity among those of solid acids, and its activity was higher than that for solid-liquid (CHCl 3 ) reaction with it. Reusability of CS 2.5 H 0.5 PW 12 O 40 was confirmed. XRD and SEM revealed that by grinding with CS 2.5 H 0.5 PW 12 O 40 , the reactant crystallites changed into very fine amorphous particles to stick to the catalyst, the crystallinity of CS 2.5 H 0.5 PW 12 O 40 being unchanged.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call