کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9614864 | 48550 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis of novel multi-site phase-transfer catalyst and its application in the reaction of 4,4â²-bis(chloromethyl)-1,1â²-biphenyl with 1-butanol
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This work describes the etherification of 4,4â²-bis(chloromethyl)-1,1â²-biphenyl and 1-butanol catalyzed by a new multi-site phase-transfer catalyst as carried out in an alkaline solution/organic solvent two-phase medium. The new multi-site phase-transfer catalysts were obtained from the reaction of 4,4â²-bis(chloromethyl)-1,1â²-biphenyl and tertiary amines. During or after completing the reaction, the mono-substituted product (4,4â²-(butoxymethyl)-1,1â²-biphenyl) and di-substituted product (4,4â²-bis(butoxymethyl)-1,1â²-biphenyl) are both produced. A rational mechanism of the etherification was proposed based on the experimental observation and a kinetic model was developed. The two apparent rate constants of the organic-phase reactions were obtained via experimental data. The reaction is greatly enhanced by adding a small quantity of the new multi-site phase-transfer catalysts. This new novel phase-transfer catalyst exhibits higher reactivity than the “single-site” quaternary ammonium salts. Preliminary studies on the kinetics and the effect of various parameters such as agitation speed, amount of organic solvent, multi-site catalysts, potassium hydroxide, water, organic solvents, inorganic salt and temperature were investigated in detail. Rational explanations of the results are made.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 229, Issues 1â2, 29 March 2005, Pages 259-269
Journal: Journal of Molecular Catalysis A: Chemical - Volume 229, Issues 1â2, 29 March 2005, Pages 259-269
نویسندگان
Maw-Ling Wang, Ze-Fa Lee, Feng-Sheng Wang,