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陈立功, Wenlei
Journal of Molecular Catalysis A: Chemical 246 (2006) 24-32,-0001,():
-1年11月30日
Methyl ester of fatty acids, derived from vegetable oils or animal fats and known as biodiesel, is a promising alternative diesel fuel regarding the limited resources of fossil fuel and the environmental concerns. In this work, an environmentally benign process for the methanolysis of soybean oil to methyl esters using calcined Mg–Al hydrotalcites as solid base catalysts in a heterogeneous manner was developed. When the reaction was carried out at reflux of methanol, with a molar ratio of soybean oil to methanol of 15:1, a reaction time 9 h and a catalyst amount 7.5%, the oil conversion was 67%. The calcined hydrotalcite with an Mg/Al ratio of 3.0 derived from calcination at 773K was found to be the optimum catalyst that can give the highest basicity and the best catalytic activity for this reaction. The catalysts were characterized with SEM, XRD, IR, DTA-TG and Hammett titration method. The activity of the catalysts for the methanolysis reaction was correlated closely with their basicity as determined by the Hammett method.
Methanolysis, Activated Mg–Al hydrotalcite, Solid base catalyst, Calcination, Biodiesel
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陈立功, Yuecheng
Journal of Molecular Catalysis A: Chemical 255 (2006) 269-274,-0001,():
-1年11月30日
Racemization of R-2-amino-1-butanol proceeded effectively over a fixed-bed Raney cobalt catalyst in a continuous fixed-bed reactor under the hydrogen pressure in the range of 2.0–6.0MPa. The performance of a fixed-bed Raney cobalt catalyst was compared with that of a pulverous Raney cobalt catalyst. The catalysts were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD), environment scanning electron microscopy (ESEM) and N2 adsorption measurement (BET). The activity and stability of the fixed-bed Raney cobalt catalyst and the effects of concentration, temperature and hydrogen pressure were examined. Racemic 2-amino-1-butanol was obtained with a total yield of over 76% under the optimum reaction conditions. Thus, an effective process for the racemization of R-2-amino-1-butanol has been established.
Racemization,
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陈立功, Ligong
Journal of Chromatography A, 986 (2003) 297-302,-0001,():
-1年11月30日
The
Electrochromatography,
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陈立功, Yuecheng
Catalysis Communications 8 (2007) 1102-1106,-0001,():
-1年11月30日
The
H-ZSM-5,
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陈立功, Yanjie
Tetrahedron Letters 46 (2005) 4377-4379,-0001,():
-1年11月30日
The total synthesis of hirsutellide A 1 was described. The linear hexadepsipeptide precursor 2 was synthesized in 45% yield from N-Boc-Me-Gly by three coupling reactions with DCC, HATU and BOP–Cl, respectively. Macrocyclization was successfully performed on the fully deprotected amino acid 14 with BOP–Cl in 15% yield and with FDDP in 22% yield.
Hirsutellide
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