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- W1972433401 abstract "Dimeric ammonium salts derived from cinchonidine or cinchonine and a bridging (anthracen-9,10-yl)dimethyl moiety bearing different counter-anions are used as chiral phase-transfer catalysts in the asymmetric alkylation reaction of a benzophenone-imine tert-butyl glycinate. The counterion generally has a great influence on the final enantioselectivity, the tetrafluoroborate or hexafluorophosphate anion giving place to higher ee’s compared to the chloride or bromide anions. The more noticeable differences are generally observed when the hexafluorophosphate salts of O-allylated dimeric catalysts are employed." @default.
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- W1972433401 date "2004-09-01" @default.
- W1972433401 modified "2023-09-28" @default.
- W1972433401 title "The counterion effect in the phase-transfer catalyzed asymmetric synthesis of α-amino acids promoted by anthryl-derived dimeric Cinchona ammonium salts" @default.
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- W1972433401 doi "https://doi.org/10.1016/j.tetasy.2004.07.025" @default.
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