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Neighboring-group effects in the reactivities of hydroxyl groups in D-glucopyranosides

Author:
Roberts, E.J., Wade, C.P., Rowland, S.P.
Source:
Carbohydrate Research 1972 v.21 no.3 pp. 357
ISSN:
0008-6215
Subject:
glucosides, chemical reactions, cellulose, cotton
Abstract:
Glucosides having the hydroxyl groups at C-2 and C-3 individually substituted were treated with N,N-diethylaziridinium chloride in the presence of concentrations of sodium hydroxide ranging from 0.1m to 6.0m. Substitution of the hydroxyl group at C-2 greatly enhances the reactivities of the hydroxyl groups at C-3 and C-4 in dilute base but has less effect in more-concentrated base. Substitution of the hydroxyl group at C-2 has little effect upon the reactivity of the hydroxyl group at C-6. Substitution of the hydroxyl group at C-3 depresses the reactivity of the hydroxyl group at C-2 throughout the range of base concentrations, but this substitution enhances the reactivity of the hydroxyl group at C-6 to a great extent in dilute base and to a much smaller extent in the more concentrated base. Proposed explanations for these results are discussed.
Agid:
36154
Handle:
10113/36154