Kumar, Raj ; Kumar, Dinesh ; Chakraborti, Asit K. (2007) Perchloric acid adsorbed on silica gel (HClO4-SiO2) as an inexpensive, extremely efficient, and reusable dual catalyst system for acetal/ketal formation and their deprotection to aldehydes/ketones Synthesis, 2007 (2). pp. 299-303. ISSN 0039-7881
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Official URL: https://www.thieme-connect.de/DOI/DOI?10.1055/s-20...
Related URL: http://dx.doi.org/10.1055/s-2006-958948
Abstract
Perchloric acid adsorbed on silica gel (HClO4-SiO2) is reported as extremely efficient, inexpensive, and reusable catalyst for dual role for protection of aldehydes/ketones (with trialkyl orthoformates) as acetals/ketals and deprotection (with water-alcohol) to regenerate the carbonyl compounds in high yields at room temperature and in short times. Acetalization/ketalization of electrophilic aldehydes/ketones was carried out under solvent-free conditions. Weakly electrophilic aldehydes/ketones and aldehydes having a substituent that can coordinate with the catalyst, required the corresponding alcohol as solvent.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Thieme Publishing. |
| Keywords: | Acetals; Ketals; Aldehydes; Ketones; Trimethyl Orthoformate (TMOF); Triethyl Orthoformate (TEOF); Protection/Deprotection; HClO4-SiO2; Dual Catalyst |
| ID Code: | 100433 |
| Deposited On: | 20 Jan 2017 05:05 |
| Last Modified: | 20 Jan 2017 05:05 |
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