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Hou J.-T.,Hebei Normal University | Chen H.-L.,Hebei Chemical Pharmaceutical Vocational Technology College | Zhang Z.-H.,Hebei Normal University
Phosphorus, Sulfur and Silicon and the Related Elements | Year: 2011

An efficient and convenient procedure for the trimethylsilylation of a wide variety of alcohols, including primary, benzylic, secondary, and phenols with hexamethyldisilazane, has been developed. The reactions were carried out at room temperature in the presence of a catalytic amount of niobium(V) chloride and afforded the corresponding trimethylsilyl ethers in high to excellent yields in short time. Copyright © Taylor & Francis Group, LLC.


Shi L.,Hebei Chemical & Pharmaceutical Vocational Technology College | Zhang X.-M.,Hebei Chemical & Pharmaceutical Vocational Technology College | Hao L.-P.,Hebei Chemical & Pharmaceutical Vocational Technology College | Liu L.-F.,Hebei Chemical & Pharmaceutical Vocational Technology College | And 2 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2015

The purification process of 3-methylxanthine by HZ16c macroporous resin is studied. The optimal purification conditions of resin are obtained based on adsorption and desorption. The key optimum conditions are: about 22.5 mg/g of the static adsorption capacities of HZ16c resin for 3-methylxanthine, 60% alcohol (pH 10.0) as the elution, 2.0 mL/min of eluting velocity and about 3 BV of elution volume. The average yield of purification process of 3-methylxanthine reaches 75%. HZ16c resin is an ideal macroporous adsorbent for separating and purifying 3-methylxanthine. This purification process could be used in industrial production. ©, 2015, China National Chemical Information Center. All right reserved.

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