Growth of single crystals of BaFe4+O3(12L), BaNi4+O3(2L) and BaCo4+O3(2L) under high oxygen pressure
โ Scribed by Masahiko Shimada; Yasuo Takeda; Hideki Taguchi; Fumikazu Kanamaru; Mitsue Koizumi
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 182 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0022-0248
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๐ SIMILAR VOLUMES
Syntheses of the title glycosides are described. The critical O-glycosylations were carried out in the presence of boron trifluoride etherate with a high degree of alpha-selectivity.
The crystals of the title compound, CjH,N,O, (M, 497.55), are monoclinic, space group P2, with a = 11&O(2), b = 8.089(l), c = 13.804(3) A, /3 = 92.52(2)", V = 1302.7 A3, and Z = 2; D, = 1.27 g.cmm3. The structure was solved by using direct methods. The refinement of all non-hydrogen atom parameters
Vicinal proton-proton spin-coupling constants for methyl 5-O-acetyl-2-O-benzoyl-3,4-O-isopropylidene-fl-L-idoseptanoside (1) have led to the assignment [1] of the twist-chair conformation, ยฐ'ITC2, 3 [2], for the seven-membered ring in 1 in which the pseudo-axis of symmetry passes through C-5. Since