Brönsted Acid of Keggin Type Polyoxometalate Catalyzed Pinacol Rearrangement

Aldes Lesbani; Risfidian Mohadi

doi:10.9767/bcrec.9.2.6074.136-141

DOI: https://doi.org/10.9767/bcrec.9.2.6074.136-141

Brönsted Acid of Keggin Type Polyoxometalate Catalyzed Pinacol Rearrangement

Aldes Lesbani^{1, 2} , Risfidian Mohadi¹

¹Department of Chemistry, Faculty of Mathematic and Natural Sciences, Sriwijaya University, Jl. Raya Palembang-Prabumulih Km.32, Ogan Ilir 30662, Sumatera Selatan, Indonesia

²Laboratory of Graduate School Program, Sriwijaya University, Jl. Padang Selasa, Palembang 30129, Sumatera Selatan, Indonesia

Received: 21 Jan 2013; Revised: 21 Apr 2014; Accepted: 3 May 2014; Available online: 27 Jul 2014; Published: 30 Aug 2014.

Editor(s): Istadi Istadi

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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. © 2014 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)

Keywords: Brönsted acid; Keggin type polyoxometalate; pinacol rearragement

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Section: Original Research Articles

Language : EN

In 2014: BCREC Volume 9 Issue 2 Year 2014 (August 2014)

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