The optimum dtp loading on zirconia catalyst weight

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Unformatted text preview: ICYC 2010 Universiti Sains Malaysia INO-P19 HIGHLY ACTIVE AND REUSABLE CATALYST FOR FRIES REARRANGEMENT OF PHENYL ACETATE Chen Ching-Feng, *Hsui-Ling Hsu, Liao Wan-Ting and Rosilda Selvin Department of Chemical and Materials Engineering, Lunghwa University of Science and Technology, 300, Wan-shou Rd., Sec. 1, Kueishan, Taoyuan, Taiwan E-mail: rosslyn@mail.lhu.edu.tw In the present study, we have reported 12-Tungstophosphoric acid included on silica nanoparticles for the Fries rearrangement of phenyl acetate. The 12-Tungstophosphoricacid included on silica nanoparticles catalyst was prepared by sol-gel method followed by steaming. The synthesized catalysts were further characterized by XRD and TEM techniques. Liquid - phase Fries rearrangement of phenyl acetate was carried out using fresh as well as steamed catalyst. It was found that the catalytic activity of steam treated 12 – Tungstophosphoric acid included on silica nan oparticles shows high activity in terms of conversion and selectivity for the desired product under mild conditions. However, the fresh catalysts are less active for the Fries rearrangement of phenyl acetate (<5 % conversion). The enhanced activity of steam treated catalysts has been explained in terms of surface acidity of the catalyst. INO-P20 THE FIRST EXAMPLE OF TERMINALLY THIOL-FUNCTIONALIZED CHOLESTERYL ESTER Huey-Charn Lee and Guan-Yeow Yeap Liquid crystal Research Laboratory, School of Chem ical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: paige_hc@yahoo.com The synthesis and mesomorphic properties of the first example of terminally thiol -functionalized monomer containing cholesteryl ester moiety are described. Steglich reaction between cholesterol and 6-bromohexanoic acid gives the corresponding ω-brominated ester derivative. The bromo-terminated product is converted to thioacetate in the presence of potassium thioacetate. Hydrolysis of the thioacetate furnishes the desired thiol-terminated cholesteryl ester. The structures of the intermediates 1 were characterized using FT-IR an...
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