منابع مشابه
Methyl 4-O-benzyl-α-l-rhamnopyranoside
In the title compound, C14H20O5, an inter-mediate in the synthesis of oligosaccharides, the glycosidic [H-C-O-C(H3)] torsion angle ϕH is 52.3° and the exo-cyclic [H-C-O-C(H2)] torsion angle θH is -11.7°. The hexa-pyran-ose ring has a chair conformation. In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds, forming chains propagating along [010]. Enclosed within the chains are R 3 (3)(1...
متن کاملMethyl α-l-rhamnosyl-(1→2)[α-l-rhamnosyl-(1→3)]-α-l-rhamnoside pentahydrate: synchrotron study
The title hydrate, C(19)H(34)O(13)·5H(2)O, contains a vicinally disubstituted tris-accharide in which the two terminal rhamnosyl sugar groups are positioned adjacent to each other. The conformation of the tris-accharide is described by the glycosidic torsion angles ϕ2 = 48 (1)°, ψ2 = -29 (1)°, ϕ3 = 44 (1)° and ψ3 = 4 (1)°, whereas the ψ2 torsion angle represents a conformation from the major st...
متن کاملSynthesis and Characterization of 2-(α-p -Substituted phenyl-α-benzimidazolo) methyl benzoxazole
2-p-substituted phenyl-2-benzimidazolo acetonitriles (1a-5a) were prepared by the reaction of benzimidazole , p-substituted benzaldehydes and Sodium cyanide. A series of 2-(α-p -Substituted phenyl-αbenzimidazolo) methyl benzoxazoles (1b-5b) were synthesized by the reaction of 2-p-substituted phenyl-2benzimidazolo acetonitrile(1a-5a) and o-aminophenol in presence of Conc. HCl. These compounds we...
متن کاملAbsolute Configuration and Polymorphism of 2-Phenylbutyramide and α-Methyl-α-phenylsuccinimide.
Crystal structures of racemic and homochiral forms of 2-phenylbutyramide (1) and 3-methyl-3-phenylpyrrolidine-2,5-dione (2) were investigated in detail by a single crystal X-ray diffraction study. Absolute configurations of the homochiral forms of 1 and 2, obtained by chromatographic separation of racemates, were determined. It was revealed that racemate and homochiral forms of 1 are very simil...
متن کاملSynthesis of quaternary α-methyl α-amino acids by asymmetric alkylation of pseudoephenamine alaninamide pivaldimine.
The utility of pseudoephenamine as a chiral auxiliary for the alkylative construction of quaternary α-methyl α-amino acids is demonstrated. The method is notable for the high diastereoselectivities of the alkylation reactions, for its versatility with respect to electrophilic substrate partners, and for its mild hydrolysis conditions, which provide α-amino acids without salt contaminants. Alter...
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ژورنال
عنوان ژورنال: Berichte der deutschen chemischen Gesellschaft
سال: 1905
ISSN: 0365-9496,1099-0682
DOI: 10.1002/cber.19050380377