Brönsted Acid of Keggin Type Polyoxometalate Catalyzed Pinacol Rearrangement

Lesbani, Aldes and Mohadi, Risfidian (2014) Brönsted Acid of Keggin Type Polyoxometalate Catalyzed Pinacol Rearrangement. Bulletin Chemical Reaction Engineering and Catalysis.


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Keggin type polyoxometalates K4a-SiW12O40 was synthesized and transformed to H4a-SiW12O40. Both catalysts have been used for pinacol rearrangement in toluene at 373 oK. The results showed that reaction of pinacol rearrangement did not proceed using K4a-SiW12O40 as catalyst. The extent reac- tion time until 20 h also did not produce pinacolone as main product. By using H4a-SiW12O40 as cata- lyst at 1 h reaction time gave conversion 100\% with formation of pinacolone 72\%. The reaction produce 27\% of 2,3-dimethyl-1,3-butadiene as byproduct and 99\% carbon balance for the reaction. This phe- nomenon indicated the Br{\"o}nsted acid is a key role for catalytic reaction of pinacol rearrangement to pinacolone.

Item Type: Article
Subjects: Q Science > QD Chemistry > QD1-999 Chemistry
Divisions: Faculty of Mathematics and Natural Science > 47201-Chemistry (S1)
Depositing User: Mr Aldes Lesbani
Date Deposited: 13 Dec 2019 01:47
Last Modified: 13 Dec 2019 01:47

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