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Read e-book online Advances in Carbohydrate Chemistry and Biochemistry, Vol. 62 PDF

By Derek Horton

ISBN-10: 0123747430

ISBN-13: 9780123747433

Considering the fact that its inception in 1945, this serial has supplied severe and integrating articles written by way of learn experts that combine commercial, analytical, and technological features of biochemistry, natural chemistry, and instrumentation method within the examine of carbohydrates. The articles offer a definitive interpretation of the present prestige and destiny developments in carbohydrate chemistry and biochemistry.

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Additional resources for Advances in Carbohydrate Chemistry and Biochemistry, Vol. 62

Example text

The computed couplings were consistent with Eq. (59) for gg and gt rotamers, and Eq. 75 3. Proton–Nitrogen Couplings a. — Coxon has measured the scalar N–1H NMR coupling constants of amino sugars over one to four bonds by three methods: (a) 1D 1H NMR, (b) 1D and 2D 1H–15N HSQMBC99,100 using an HCN cryoprobe,66 and (c) 1D 1H–15N CPMG-HSQMBC101 using a normal broadband probe. 3 Hz. The common amino sugars were usually present in the original crystal principally as a single pyranose anomer, either a or b, which underwent tautomeric interconversion to as many as four other forms on dissolution.

56 Some 14 years after publication of the original Haasnoot equation, it was reparametrized to include a li group electronegativity scale and specific parameters for substituted ethane derivatives,57 regardless of degree of substitution: 3 JHCCH ¼ 14:63 cos2 ’ À 0:78 cos ’ þ 0:60 X Â Ã þ li 0:34 À 2:31 cos2 ðsi ’ þ 18:4jli jÞ ð20Þ i where the sign parameter is now si ¼ Æ 1. 57 Molecular geometries were recalculated using the MM2-85 force field. 36 Hz. 03 for NH2, NHR, NR2, OH, OR, and R ¼ alkyl.

COXON function of the interglycosidic angle c. Careful attention was paid to the effects of rotameric populations about the C-1–O-1, O-1–C-40 , and C-5–C-6 bonds in the models. 122 For example, for HO–C–C–O–C–OH pathways, the magnitude of coupling between the terminal carbon nuclei is enhanced when the terminal oxygen atoms lie in the C–C–O–C plane (’CCOC ¼ 180 ). Similar effects were observed for ’CCOC ¼ 60 when the terminal oxygen was in-plane (HO–C–O–C or O–C–C–OH plane). Out-ofplane terminal oxygen substituents and oxygen substituents on internal carbon atoms appeared to exert little effect on the magnitude of the coupling.

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Advances in Carbohydrate Chemistry and Biochemistry, Vol. 62 by Derek Horton

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