期刊
CATALYSIS LETTERS
卷 145, 期 3, 页码 769-776出版社
SPRINGER
DOI: 10.1007/s10562-015-1477-8
关键词
Glycerol; Tin salt catalysts; Ketalization; Bioadditives
资金
- CAPES
- CNPq
- FAPEMIG
Herein, an efficient and environmentally benign tin-based process who is a simple and available commercially catalyst, was used in the glycerol ketalization with different ketones at room temperature and solvent-free reactions. Although being a molecule highly functionalized, glycerol was selectively converted to ketal in all the SnCl2-catalyzed reactions. A high regioselectivity (ca. 78-99 % for 1,3-dioxolane derivatives) was achieved for ketones with straight or cyclic chain having up to six carbon atoms. Conversely, glycerol ketalization with branched carbon chain ketones containing six carbon atoms (i.e. 4-methyl-2-pentanone) resulted in the equimolar formation of two isomers products (i.e. cis and trans-1,3-dioxolane isomers glycerol derivatives). The main reaction parameters such as the ketone nature, reactants stoichiometry and catalyst concentration were assessed. The SnCl2 catalyst operate at mild and solvent-free reaction conditions and was successively recovered and reused without activity loss.
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