The Crystal and Molecular Structure of beta-Lyxose.

Hordvik, Asbjørn; Smedman, Leif-Åke; Schroll, Gustav; Bowie, J. H.; Williams, D. H.; Bunnenberg, E.; Djerassi, Carl; Records, Ruth

doi:10.3891/acta.chem.scand.20-1943

Cited by 24 publications

(6 citation statements)

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“…9 A, 18;19 which is similar to the distance (about 2.8 A) between the ring oxygen and the axial hydroxyl oxygen at C-2 in D D -lyxose. 20 Therefore, it is probable that the onset shift of the CD band will not occur for D D -lyxose if its axial hydroxyl group at C-2 can shield the ring oxygen from the solvent as well as from the hydroxymethyl group at C-5. As shown in Figure 3, isomaltose and maltose exhibit similar CD spectra: the peak wavelength is similar, but the peak for isomaltose is higher than that for maltose.…”

Section: Relationships Between Vuvcd Spectra and The Structure Of Monmentioning

confidence: 99%

Vacuum-ultraviolet circular dichroism study of saccharides by synchrotron radiation spectrophotometry

Matsuo

Gekko

2004

Carbohydrate Research

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Section: Relationships Between Vuvcd Spectra and The Structure Of Monmentioning

confidence: 99%

Vacuum-ultraviolet circular dichroism study of saccharides by synchrotron radiation spectrophotometry

Matsuo

Gekko

2004

Carbohydrate Research

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“…A mean sulfur-sulfur bond length of 2.075 (6) A and a mean CSSC dihedral angle of 106"3 ° were found in the X-ray crystallographic structure determination of the complex cyclo-di-tu-{bis- [2-(N,N-dimethylamino)ethyl]-disulfide}dicopper(I) tetrafluoroborate (Ottersen, Warner & Serf, 1973a). This bond length differs significantly from those usually found in aliphatic disulfides with dihedral angles near to 90 ° (Hordvik, 1966;Lee, 1972;Lee & Bryant, 1970;Lee & Bryant, 1969aOttersen, Warner & Serf, 1973b). The sulfur-sulfur bond lengths reported for dicinnamyl disulfide (lee & Bryant, 1971) and dibenzyl disulfide (Lee & Bryant, 1969b; van Dijk & Visser, 1971) are 2.01 (1) and 2.02 (1) A, with CSSC dihedral angles of 66.4 and 92.1 °, respectively.…”

Section: Introductionmentioning

confidence: 69%

“…The sulfur-sulfur bond lengths reported for dicinnamyl disulfide (lee & Bryant, 1971) and dibenzyl disulfide (Lee & Bryant, 1969b; van Dijk & Visser, 1971) are 2.01 (1) and 2.02 (1) A, with CSSC dihedral angles of 66.4 and 92.1 °, respectively. Hordvik (1966) gives 2.03-2.05 A as the expected length of an aliphatic S-S bond. Although CSSC dihedral angles of 105 to 110 ° have been reported (Foss, Johnsen & Tvedten, 1958;Foss & Johnsen, 1965;Oughton & Harrison, 1959), values between 80 and 100 ° (Hordvik, 1966;Lee & Bryant, 1969) are usually observed.…”

Section: Introductionmentioning

confidence: 96%

“…Hordvik (1966) gives 2.03-2.05 A as the expected length of an aliphatic S-S bond. Although CSSC dihedral angles of 105 to 110 ° have been reported (Foss, Johnsen & Tvedten, 1958;Foss & Johnsen, 1965;Oughton & Harrison, 1959), values between 80 and 100 ° (Hordvik, 1966;Lee & Bryant, 1969) are usually observed. Repulsion between the lone-pair electrons is expected to be at a minimum when the dihedral angle is 90 ° (Bergson, 1957).…”

Section: Introductionmentioning

confidence: 96%

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The crystal and molecular structure of bis[2-(N,N-dimethylamino)ethyl]disulfide dihydrochloride

Ottersen¹,

Warner²,

Seff³

1973

Acta Crystallogr Sect B

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The crystal and molecular structure of bis- [2-(N,N-dimethylamino)ethyl]disulfide dihydrochloride [alternatively named 2,2"-dithiobis-(N,N-dimethyl)ethylamine dihydrochloride] has been determined crystallographically using the 1972 unique and significant reflections for which 20< 52 °, and refined to an R index of 0.043. Counter methods with graphite monochromatized Mo K~ radiation were employed. All hydrogen atoms were located on a difference Fourier function. Crystals form in the monoclinic space group P21/c with cell dimensions a = 11"646 (2), b = 11"065 (2), c = 12.370 (3) ,~ and/~ = 112.40 (2) °.Estimated standard deviations in non-hydrogen bond lengths range from 0.001 to 0.005 A and, in angles, from 0.11 to 0-26 °. The sulfur-sulfur bond length is found to be 2.037 (1) A with a dihedral angle of 82.4 (2) °. A short intermolecular contact (3.55 A) between a sulfur atom and a chloride ion is observed.

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“…An example fl-Lyxose has been studied in a single-crystal X-ray diffraction experiment and its quantitative structure determination reported by Hordvik (1966). The structure has symmetry P2~2121; unit-cell dimensions a = 9.58, b = 10.35, c = 6-52 A; and four formula units of CsH~005 per unit cell.…”

Section: The Exponential Modelmentioning

confidence: 99%

Electron density: an exponential model

Collins¹,

Mahar²

1983

Acta Cryst Sect A

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Electron density ideally is positive definite. The imperfect experimental data of an X-ray diffraction experiment do not lead to such a function when the density is obtained from structure factors by the linear relationship of Fourier transformation. At the price of certain but quite small bias, electron density may be represented by an otherwise completely general exponential model. The model is based on iterative correction of a logarithm which yields a density approximation of resolution substantially higher than that afforded by Fourier transformation of structure factors.

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The Crystal and Molecular Structure of beta-Lyxose.

Cited by 24 publications

References 0 publications

Vacuum-ultraviolet circular dichroism study of saccharides by synchrotron radiation spectrophotometry

Vacuum-ultraviolet circular dichroism study of saccharides by synchrotron radiation spectrophotometry

The crystal and molecular structure of bis[2-(N,N-dimethylamino)ethyl]disulfide dihydrochloride

Electron density: an exponential model

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