Cyclitols. Part XXXIV. X-Ray crystal and molecular structure of 1,2:5,6-Di-O-isopropylidene-3,4-di-O-tosyl-L-chiro-inostol, and its conformation in solution by nuclear magnetic resonance
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 14,p. 2039-2044
- https://doi.org/10.1039/p29720002039
Abstract
The crystal structure of the title compound was determined from X-ray diffractometer data by direct methods and refined by least-squares techniques to R 0·047 for 1317 observed reflections. Crystals are tetragonal, space group P41212, a= 9·304 ± 0·005, c= 32·008 ± 0·017 Å, Z= 4. The cyclohexane ring was found to be in a flattened skew conformation, with four substituents in axial orientation. By contrast, n.m.r. spectroscopy indicates that in solution the title compound adopts predominantly a distorted chair conformation. The conformations of six-membered rings fused to five-membered rings are discussed.Keywords
This publication has 0 references indexed in Scilit: