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- Title
IR Spectra and Component Ratios in SiO<sub>2</sub>–TiO<sub>2</sub>*Organic Acid Composites―New Catalysts for the Asymmetric Biginelli Reaction.
- Authors
Fedorova, O. V.; Koryakova, O. V.; Valova, M. S.; Rusinov, G. L.
- Abstract
The amount of acid retained in the SiO2–TiO2*organic acid composites obtained by the sol-gel method depends on the structure of the acid and its concentration, but largely on the oxide ratio. At an acid concentration in the composite of less than 25%, its molecules undergo chemisorption accompanied by a change in the principal absorption bands in the IR spectra; as the acid concentration increases, physical sorption becomes prevalent. With acid-imprinted composites, an increase in the ee values in the asymmetric Biginelli reaction is observed, and the best results were obtained for aromatic acid-imprinted composites with an oxide ratio of 1 : 1.
- Subjects
ACID catalysts; SOL-gel processes; CHEMISORPTION
- Publication
Russian Journal of General Chemistry, 2023, Vol 93, pS382
- ISSN
1070-3632
- Publication type
Article
- DOI
10.1134/S1070363223140384