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- W2000652960 abstract "Abstract Poly(cinchona alkaloid- co -acrylonitrile) 1a – d and poly(cinchona alkaloid aciylate) 2a – b catalyze the enantioselective cycloaddition of ketene to chloral for the preparation of ( R )- and ( S )-β-(trichloromethyl)-β-propiolactone. Copolymers 1a – d showed relatively lower catalytic activity with moderate enatioselectivity (22–59% e . e .), while homopolymers 2a – b gave similar catalytic activity and enatioselectivity (60–94% e . e .) compared to those of their monomeric alkaloids as catalysts. The polymeric effect was observed with poly(acryloyl quinidine) 2a as catalyst to get the best enantioselectivity of 94% e . e . at the tempereture −30°C." @default.
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- W2000652960 date "1994-07-01" @default.
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- W2000652960 title "Polymeric cinchona alkaloids as catalysts in the enantioselective 2,2-cycloaddition reaction of ketene and chloral" @default.
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- W2000652960 doi "https://doi.org/10.1016/0957-4166(94)80160-6" @default.
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