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.