References
- Greene , T. W. 1981 . Protective Groups in Organic Syntheses , 16 New York : John Wiley and Sons, Inc. . and references cited therein
- Grove , J. F. , MacMillan , J. , Mulholland , T. P.C. and Turner , W. B. 1961 . J. Chem. Soc. , : 3049
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- This kind of acidic ion-exchange resin, Amberlyst H-15 or Dowex-50W-X8, was already used as a catalyst for protection of alcohols with the tetrahydropyranyl group and its removal at room temperature. 7
- Bongini , A. , Gardillo , G. , Orena , M. and Sandri , S. 1979 . Synthesis , : 618
- Beier , R. and Mundy , B. P. 1979 . Synth. Commun. , 9 : 271
- Kieczykowsky , G. R. , Quesada , M. L. and Schlessinger , R. H. 1982 . J. Am. Chem. Soc. , 102 : 782
- Kametani , T. , Katoh , T. , Tsubuki , M. and Honda , T. 1986 . J. Am. Chem. Soc. , 108 : 7055
- Purchased resin, Dowex-50W-X2 (H +form) was used after successive washing with dist. H2O, 2N NaOH, dist. H2O and 2N HCl, then dist. H2O on a glass-filter until the filtrate was neutral. Without this conditioning, the reactions were complicated by side-reactions resulted from strongly acidic conditions (see text)