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Physical Methods in Heterocyclic Chemistry. Volume 3 by Alan R. Katritzky

By Alan R. Katritzky

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Skancke, Ada Chem. Scand. 15, 711 (1961). J. E. Kilpatrick, K. S. Pitzer, and R. Pitzer, J. Amer. Chem. Soc. 69, 2483 (1947). K. S. Pitzer and W. E. Donath, J. Amer. Chem. Soc. 81, 3213 (1959). E. L. Eliel, N. L. Allinger, S. J. Angyal, and G. A. " Wiley (Interscience), New York, 1965. H. J. Geise, W. Adams, and L. S. Bartell, Tetrahedron 25, 3045 (1969). H. Hope and J. D. McCullough, Ada Cryst. 17, 712 (1964). ΙΠ] P. ANDERSEN AND O. HASSEL tron diffraction investigations of tetrahydrofuran, tetrahydrothiophene, tetrahydroselenophene, and of 1,2,4-trioxacyclopentane have also been carried out and conformational energies calculated employing the "Westheimer-Hendrickson" method.

Ii] P. ANDERSEN AND O. 0 Ä FIG. 8. Radial distribution curve of C0 2 showing the two peaks corresponding to the C—0 bond distance and the 0---0 interatomic distance. that the part of the molecular intensity curve with s values above 35 would not be of great importance. This because of the low value of the amplitude of the sine waves beyond this value of s. It is, however, at present possible to produce diffraction diagrams of remarkably high quality and to carry out reliable microphotometrical measurements reaching s values of about 60.

8. R. C. Lord and G. J. , Spectrochim. Ada Part A 23, 2551 (1967). 9. M. " Elsevier, Amsterdam, 1963. 10. R. C. Lord and F. A. Miller, Appl. Spectrosc. 10, 115 (1956). A] G. J. THOMAS, JR. , without change in frequency, and is referred to as Rayleigh scattering. Another type of elastic scattering of light is Tyndall scattering, which results not from individual molecules or atoms as such, but from scattering by larger particles randomly distributed in the medium, such as colloidal and dust particles.

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