Brönsted Acid of Keggin Type Polyoxometalate Catalyzed Pinacol Rearrangement
| Main Authors: | Lesbani, Aldes, Mohadi, Risfidian |
|---|---|
| Format: | Article PeerReviewed application/pdf |
| Terbitan: |
Diponegoro University
, 2014
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| Subjects: | |
| Online Access: |
http://eprints.unsri.ac.id/4761/1/6074%2D15243%2D1%2DPB.pdf http://eprints.unsri.ac.id/4761/ |
Daftar Isi:
- 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.