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Volumn 15, Issue 3, 2009, Pages 167-171

Silica-PCl5: A novel heterogenous catalyst for simple and efficient chemoselective protection of carbonyl compounds

Author keywords

Carbonyl compounds; Dithianes; Dithiolanes; Silica PCl5; Thioacetalization

Indexed keywords

EID: 67651109284 PISSN: 07930283 EISSN: None Source Type: Journal
DOI: None Document Type: Article

Times cited : (2)

References (30)

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- Preparation of Silica-PCl5: 15 g. of dry silica was mixed with 10 g of PC15. To this 50 ml. of dry dichloromethane was added drop wise and the mixture was stirred at room temperature for one hour. Solvent was evaporated and the Contents were heated at 70 °C for three hours with stirring. HCI evolved was removed with a slow stream of Nitrogen. Contents were then washed with 100 ml. of dichloromethane, filtered under vacuum and dried at 100 °C for three hours. The free flowing white Silica-PCI 5 thus obtained was stored in a tightly caped bottle. IR spectra of both silica and Silica-PCl5 were found to be similar and both showed strong adsorption at 1098 cm-1 and 800 cm-1. Acid-Base titration of the reagent gave a total acid content of 54 mg KOH/g of Silica-PCl5
- 5.

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