Topic
Pyranose
About: Pyranose is a research topic. Over the lifetime, 1619 publications have been published within this topic receiving 35348 citations. The topic is also known as: pyranoses & hexopyranose.
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TL;DR: The crystal structure of β-D-acetyl cellobiose was studied by X-ray crystallography as mentioned in this paper, and the structure was refined by block-diagonal least-squares to a final R value of 0.075 for 2605 observed reflections.
Abstract: The crystal structure of β-D-acetyl cellobiose was studied by X-ray crystallography. The crystal data are a = 31.814(4), b = 19.414(5), c = 5.614(1) A, space group P212121, Z = 4. The structure, solved by direct method, was refined by block-diagonal least-squares to a final R value of 0.075 for 2605 observed reflections. The molecular conformation involves 4C1 pyranose rings with glycosidic torsion angles corresponding to near maximum extension of the molecule. Substantial differences in conformational angles were observed between this molecule and the unacetylated counterpart. The molecules lie along the a-axis of the unit cell.
33 citations
32 citations
TL;DR: A series of new chiral cyclometalated platinum(II) complexes containing carbohydrate phosphine ligands have been prepared in this article, where the reaction of [Pt(ppy)Cl]2 (Hppy = 2-phenylpyridine) with the chiral phosphines n-Hmbpa (methyl 4,6-O-benzylidene-n-deoxy-n-(diphenylphosphino)-α-D-altropyranoside, n = 2 or 3) afforded cis-[Ptppy
Abstract: A series of new chiral cyclometalated platinum(II) complexes containing carbohydrate phosphine ligands have been prepared. The reaction of [Pt(ppy)Cl]2 (Hppy = 2-phenylpyridine) with the chiral phosphines n-Hmbpa (methyl 4,6-O-benzylidene-n-deoxy-n-(diphenylphosphino)-α-D-altropyranoside, n = 2 or 3) afforded cis-[Pt(ppy)(n-Hmbpa)Cl] (n = 2 2a or 3 2b) in high yields. Treatment of 2a or 2b with an excess of NaOCH3 gave the alkoxoplatinum(II) complexes trans-[Pt(ppy)(n-mbpa)] (n = 2 3a or 3 3b). The crystal structure of 3b shows that the phosphorus atom is located trans to the nitrogen atom of the ppy ligand and the pyranose ring is in a boat conformation. Moderately intense UV-vis absorption bands assigned to metal-to-ligand charge-transfer (MLCT) transitions are shifted from ca. 376–382 to ca. 414–416 nm when the chloride ligand is substituted by the pendant alkoxide group. In solid state and 77 K MeOH–EtOH (4∶1) glass solution, complexes 2 and 3 show a vibronic structured emission in the range 450–650 nm. Complex 2 is non-emissive in fluid solution at room temperature whereas 3 shows a long-lived 3MLCT emission in both CH3CN and CH2Cl2 at room temperature.
32 citations
TL;DR: The ability of gPDH for direct electron transfer (DET) was discovered, which is rather unique among FAD-containing enzymes, and makes dgPDH attractive for construction of biofuel cells with high power output.
32 citations
TL;DR: In this article, the tautomerism of D -galactose in water has been studied by using g.l.c. to separate per-O -trimethylsilyl derivatives of D-galactoses tautomers formed during the mutarotation reaction.
32 citations