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Distribution of substituents in 2-hydroxypropyl ethers of cyclomaltoheptaose

โœ Scribed by Josef Pitha; C. Trinadha Rao; Bengt Lindberg; Pia Seffers


Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
441 KB
Volume
200
Category
Article
ISSN
0008-6215

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## Cyclomaltoheptaose @-cyclodextrin, @CD) is attracting attention with its remarkable properties of molecular encapsulation (for examples see ref 1). Its solubility in water, however, is somewhat limited: only 18 g (0.0158 mol) per liter. Derivatization, e.g., ether formation, leads to substantia

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2-O-[(S)-2-Hydroxypropyl]cyclomaltoheptaose crystallises in the monoclinic space group P2(1) with unit-cell dimensions a = 15.072(1), b = 10.409(1), c = 20.623(2) A, and beta = 108.52(1) degrees. The structure was solved by X-ray diffraction and refined to an R-value of 0.096. The macrocyclic ring o

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## Structural characteristics of 0-(2-hydroxypropyl)cellulose samples, namely the molar substitution (mol. subst.), the total degree of substitution (d.s.), and the individual degree of substitution of hydroxyl groups on the glucose residues for a wide mol. subst . range of samples were determined

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Samples of O-(2-hydroxypropyl)derivatives of cyclomaltoheptaose (beta-cyclodextrin) with increasing substitution were prepared by withdrawing aliquots at different times from a reaction mixture containing cyclomaltoheptaose and an excess of (S)-propylene oxide in 0.39 M aqueous sodium hydroxide. The