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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    Abstract

    Keggin type polyoxometalates K4[a-SiW12O40] was synthesized and transformed to H4[a-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 K4[a-SiW12O40] as catalyst. The extent reac- tion time until 20 h also did not produce pinacolone as main product. By using H4[a-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 Brönsted acid is a key role for catalytic reaction of pinacol rearrangement to pinacolone.

    Item Type: Article
    Subjects: Q Science > QD Chemistry
    Divisions: Faculty of Mathematics and Natural Sciences > Department of Chemistry
    Depositing User: Mr Aldes Lesbani
    Date Deposited: 08 Oct 2014 11:26
    Last Modified: 08 Oct 2014 11:26
    URI: http://eprints.unsri.ac.id/id/eprint/4761

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