Investigation of Sn(IV) catalysts in glycerol acetylation
| Autor: | Simoni M.P. Meneghetti, Janaína H. Bortoluzzi, Felyppe M. R. S. Altino, Débora S. da Silva |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010405 organic chemistry
Process Chemistry and Technology chemistry.chemical_element Activation energy 010402 general chemistry 01 natural sciences Medicinal chemistry Catalysis 0104 chemical sciences Dibutyltin dilaurate chemistry.chemical_compound Reaction rate constant chemistry Butyltin trichloride Chlorine Glycerol Physical and Theoretical Chemistry Selectivity |
| Zdroj: | Molecular Catalysis. 494:111130 |
| ISSN: | 2468-8231 |
| Popis: | The catalysts dibutyltin dichloride (Bu2SnCl2), dimethyltin dichloride (Me2SnCl2), butyltin trichloride (BuSnCl3), dibutyltin dilaurate (Bu2SnLau2), butyl stannoic acid [BuSnO(OH)], and di-n-butyl-oxo-stannane (Bu2SnO) were investigated in the acetylation of glycerol (GLY). To the best of our knowledge, this is the first time that this family of catalysts is employed for this reaction and the catalysts bearing chlorine substituents provided the best results. The most active system (BuSnCl3) leads to the total conversion of GLY and shows very good selectivity (25.7, 43.5 and 30.8 % for MA, DA and TA, respectively) under mild reaction conditions (80 °C, AA:GLY molar ration of 4:1 with 3 h of reaction). The apparent rate constants (kap) for the GLY conversion confirm these results, since values of 29.1 × 10−3, 67.9 × 10−3 and 87.2 × 10−3 h−1 were obtained at 40, 80 and 120 °C, respectively. The activation energy for GLY conversion was determined and for the reaction performed without catalyst the estimated value was 23.9 kJ mol−1 while using BuSnCl3 it was 14.3 kJ mol−1, representing a decrease of around 50 %. |
| Databáze: | OpenAIRE |
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