6-C-(2-Furyl)-1,2:3,4-di-O-isopropylidene-~-D-g~yce~o-D-ga~~c~o-hexopyranose (1) has been investigated by X-ray diffraction methods. The crystals obtained from ethyl acetate-light petroleum were monoclinic, space group P2, (2 = 2)) with cell dimensions a = 13.796(2), b = 7.887(l), c = 8.035(l) A, an
An NMR, X-ray crystal structure, and molecular mechanics study of di-(3-deoxy-d-glycero-pentulose) 1,2′:2,1′ dianhydride
✍ Scribed by Alfred D. French; George A. Jeffrey; Philip Pfeffer; Robert L. Dudley; Younghee Yeon; Ernst Nitsch
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 890 KB
- Volume
- 260
- Category
- Article
- ISSN
- 0008-6215
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The crystals of the title compound arc orthorhombic, space group P2,2,2, (Z = 4) with cell dimensions a = 9.791(l), b = 10.235(l), c = 17.703(2) A. The pyranoid ring has a hybrid twist + screw ("T2+"S5) conformation, and the configuration at C-7 is (R).
## Abstract **Summary:** The crystal structure of syndiotactic 3,4‐poly(2‐methyl‐1,3‐butadiene) has been determined by the joint use of molecular mechanics and X‐ray diffraction. Molecular mechanics calculations have been performed both on the isolated chain and on the crystal by the use of various
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