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General procedure for the (salen)Ti(IV)-catalyzed ring-opening reaction: To a 25 mL of 4-necked flask was placed 0.1 mmol of chiral salen ligand, 5 mL of dry toluene, and 0.1 mmol of Ti(OPr-i)4 at room temperature under a nitrogen atmosphere. After stirring for 1 h, to the resulting mixture was added dropwise 1 mmol of dithiophosphorus acid. The reaction was stirred for additional 0.5 h. Then 1mmol of epoxide was added and the whole was stirred for 5-10 min (monitored by TLC, After removal of solvent, the crude product was analyzed by 31P NMR, and then purified by column chromatography on silica gel (200-300 mesh, gradient eluted with petroleum ether/ethyl acetate) to provide the ring-opening product 4 and 5. The ee value of the product was fdetermined by chiral HPLC analysis
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31P NMR, and then purified by column chromatography on silica gel (200-300 mesh, gradient eluted with petroleum ether/ethyl acetate) to provide the ring-opening product 4 and 5. The ee value of the product was fdetermined by chiral HPLC analysis.
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