✦ LIBER ✦

Crystal structure of anhydrous heptakis-(2,6-di-O-methyl) cyclomaltoheptaose (dimethyl-β-cyclodextrin)

✍ Scribed by Thomas Steiner; Wolfram Saenger

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 494 KB
Volume: 275
Category: Article
ISSN: 0008-6215
DOI: 10.1016/0008-6215(95)00148-m

No coin nor oath required. For personal study only.

✦ Synopsis

An X-ray diffraction study was carded out on dimethyl-/3-cyclodextrin which crystallized from aqueous solution at 60°C without water of hydration. The molecule adopts a round shape which is stabilized by systematic intramolecular O-3-H.-. 0-2 hydrogen bonds between neighboring glucose units. The O-6-C-8 groups of three glucoses are oriented towards the molecular axis so that the cyclodextrin cavity is closed at one end. The remaining volume of the bowl-shaped cavity is occupied by part of the C-6-O-6-C-8 rim of a neighboring molecule (self-inclusion).

📜 SIMILAR VOLUMES

Crystal structure of the 1:1 complex of

Crystal structure of the 1:1 complex of heptakis(2,3,6-tri-O-methyl)cyclomaltoheptaose (permethylated β-cyclodextrin) with ethyl laurate

✍ Dimitri Mentzafos; Irene M. Mavridis; Henk Schenk 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 714 KB

The crystal of the 1: 1 complex of ethyl laurate with heptakis(2,3,6-tri-0-methyl)cyclomaltoheptaose (ThI-@CD, permethyIated &cyclodextrin) is orthorombic, P&2,2,, with a = 14.796(Z), b m 22.444(6), c = 27.720@) A; V = 9~5(4) k3; and Z = 4. The macrocycles have a distorted ~nfo~ation due to the abse

Heptakis(2,6-di-o-methyl)-β-cyclodextrin

Heptakis(2,6-di-o-methyl)-β-cyclodextrin complexation with the antitumor agent chlorambucil

✍ Alison R. Green; J. Keith Guillory 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 496 KB

Physical properties of the complexes for

Physical properties of the complexes formed between heptakis(2,6-di-O-methyl)-β-cyclodextrin, β-cyclodextrin, and chlorambucil

✍ Alison R. Green; Erik S. Miller; J. Keith Guillory 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 379 KB

Complex formation of some nonionic surfa

Complex formation of some nonionic surfactants with hydroxypropyl-β-cyclodextrin and with heptakis (2,6-di-O-methyl)-β-cyclodextrin

✍ Esther Forgacs 📂 Article 📅 1994 🏛 Springer Netherlands 🌐 English ⚖ 396 KB

Stereoselective reduction of (R)-()-car

Stereoselective reduction of (R)-()-carvone with sodium dithionite in the presence of cyclomaltoheptaose (β-cyclodextrin) and its heptakis(2,6-di-O-methyl) derivative

✍ Roberto Fornasier; Franco Marcuzzi; Michele Parmagnani; Umberto Tonellato 📂 Article 📅 1991 🏛 Elsevier Science 🌐 English ⚖ 289 KB

Regio-and stereo-selective reduction of the double bonds in conjugated ketones with numerous reducing agents under various conditions have been studied'. The reactions usually afford mixtures of products, the compositions of which depend on the reagent, the catalyst, the solvent, the pH of the mediu

Crystal structures of heptakis(2,3,6-tri

Crystal structures of heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin complexes with (R)- and (S)-Flurbiprofen

✍ Kazuaki Harata; Kaneto Uekama; Teruko Imai; Fumitoshi Hirayama; Masaki Otagiri 📂 Article 📅 1988 🏛 Springer Netherlands 🌐 English ⚖ 846 KB