Crystal structures of heptakis(2,6-di-O-tert-butyldimethylsilyl)cyclomaltoheptaose, heptakis(2-O-methyl-3,6-di-O-tert-butyldimethylsilyl)-cyclomaltoheptaose and heptakis(2-O-methyl)-cyclomaltoheptaose

Authors
Reibenspies, JH Maynard, DK Derecskei-Kovacs, A Vigh, G
Citation
Jh. Reibenspies et al., Crystal structures of heptakis(2,6-di-O-tert-butyldimethylsilyl)cyclomaltoheptaose, heptakis(2-O-methyl-3,6-di-O-tert-butyldimethylsilyl)-cyclomaltoheptaose and heptakis(2-O-methyl)-cyclomaltoheptaose, CARBOHY RES, 328(2), 2000, pp. 217-227
Citations number
16
Categorie Soggetti
Agricultural Chemistry","Chemistry & Analysis","Organic Chemistry/Polymer Science
Journal title
CARBOHYDRATE RESEARCH
ISSN journal
00086215 → ACNP
Volume
328
Issue
2
Year of publication
2000
Pages
217 - 227
Database
ISI
SICI code
0008-6215(20000908)328:2<217:CSOH>2.0.ZU;2-S
Abstract
Crystal structures of heptakis(2,6-di-O-tert-butyldimethylsilyl)cyclomaltoh eptaose, heptakis(2-O-methyl-3,6-di-O-tert-butyldimethylsilyl)cyclomaltohep taose and heptakis(2-O-methyl)cyclomaltoheptaose were determined from X-ray diffraction patterns obtained for single crystals of the title compounds g rown from ethyl acetate and ethanol, respectively, as solvent. The crystal structures prove conclusively that quantitative migration of the tert-butyl dimethylsilyl group from the 2-O- to the 3-O-position [D. Icheln, B. Gehrck e, Y. Piprek, P. Mischnick, W.A. Konig, M.A. Dessoy, A.F. Morel, Carbohydr. Res., 280 (1996) 237-250] was achieved during methylation of heptakis(2,6- di-O-tert-butyldimethylsily)cyclomaltoheptaose by iodomethane-sodium hydrid e. (C) 2000 Elsevier Science Ltd. All rights reserved.