Journal
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
Volume 194, Issue 9, Pages 866-878Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10426507.2018.1487426
Keywords
Liquid sulfonic acid catalyst; dual solvent-catalyst activity; acetylation; vitamin E; tocopherol
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Funding
- University of Malaya, Malaysia [RP025A/B/C-14AET]
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4-Imidazol-1-yl-butane-1-sulfonic acid (ImBu-SO3H) has been successfully synthetized and fully characterized by FT-IR and high-resolution NMR spectroscopy (H-1, C-13). The plausible alternative structures of ImBu-SO3H were discussed on the basis of its NMR data. The ionic liquid showed interesting dual solvent-catalyst property, which was studied experimentally for the acetylation of a variety of functionalized alcohols, phenols, thiols, amines and a-tocopherol (a-CTP) as the most active form of vitamin E with acetic anhydride and which provided good yields within a short reaction time. ImBu-SO3H was successfully recycled by product extraction with an average recovered yield of 82% for 5 subsequent runs. The catalytic activity of the recycled ImBu-SO3H showed almost no loss even after five consecutive runs. [GRAPHICS] .
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