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A practical procedure has been developed for grafting poly(amino acid) on silica gel as an efficient and recoverable catalyst in the Juliá–Colonna asymmetric epoxidation with high enantioselectivities. Separation and recovery of the catalyst of poly(amino acid) have been remarkably improved by grafting on silica gel without a significant loss of enantioselectivity and activity.
Protection of carbonyls as acetals or ketals using Bronsted acidic ionic liquid [Hmim]BF 4 as catalyst as well as solvent was investigated. Satisfactory results were obtained for the protection of carbonyls as cycloacetals or ketals with diols. The product can be separated conveniently from the reaction system, and the ionic liquid can be reused after removal of water.
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