Sheppard, Harry

Sheppard, Harry J. Review of Mutus liber (introduction commentary by Jean Laplace), by Altus. In Ambix 27 66-67.. ... 

Sheppard, Harry J. The redemption theme and Hellenistic alchemy. Ambix 7, no. 

Sheppard, Harry J. "European alchemy in the context of a universal definition." In Die Alchemie in der europaischen Kulur- und Wissenschaftsgesischte, ed. Christoph Meinel, 13-17. Wiesbaden Harrassowitz, 1986. 

Sheppard, Harry J. "The mythological tradition and seventeenth century alchemy." In Science, medicine and society in the Renaissance essays to honor W Pagel, ed. Allen George Debus, 47-59. London , 1972. 

Sheppard SMF, Harris C (1985) Hydrogen and oxygen isotope geochemistry of Ascension Island lavas and granites variation with crystal fractionation and interaction with sea water. Contrib Miner Petrol 91 74-81... 

C. Rodger, N. Sheppard, H. C. E. McFarlane and W. McFarlane, Group VI — Oxygen, sulfur, selenium and tellurium, in NMR and the Periodic Table, R. K. Harris and B. E. Mann, eds., Academic Press, London, 1978. O. Lutz, Group VI elements other than oxygen, in The Multinuclear Approach to NMR Spectroscopy, J. B. Lambert and F. G. Riddell, eds., NATO ASI Series, D. Reidel Publishing Company, Dordrecht, 1982. H. C. E. McFarlane and W. McFarlane, Sulfur, selenium, and tellurium, in Multinuclear NMR, J. Mason, ed., Plenum Press, New York, 1987. 

Clyburn, Harry, and Sheppard, Walter Lee, Jr., P.E., Uses of Chemically Resistant... 

RA Fletton, RK Harris, AM Kenwright, RW Lancaster, KJ Packer, N Sheppard. A comparative spectroscopic investigation of three pseudopolymorphs of testosterone using solid-state i.r. and high-resolution solid-state NMR. Spectrochim Acta 43A 1111-1120, 1987. 

Harris and Sheppard (1961) measured the line width in the fast-exchange limit, which has been shown to be a satisfactory procedure by Alexander (1962, 1963) provided second-order spectra at low-... 

Inversion in cyclo-octane has been investigated by Harris and Sheppard (1961) down to — 160°K. At this temperature there is considerable exchange broadening ( 5-8 c.p.s.). A low enthalpy of activation of 2-6 + 0-9 kcal mole-1 was suggested with an abnormally large negative entropy — 30 e.u. The conformational inversion process under study is not easy to define. The conformations set out below would indicate that each separate form should contain four non-equivalent protons, which are designated by numbers. 

Reported value is 9 7 kcal, and is corrected by + 0-5 kcal, following Harris and Sheppard (3). d 200°-250° K. temperature range. 

Harris and Sheppard (1963) extended the use of magnetic nonequivalence introduced by the natural C13 abundance ( %) to... 

Harris and Sheppard (1961) measured the line width in the fast-exchange limit, which has been shown to be a satisfactory procedure by Alexander (1962, 1963) provided second-order spectra at low-temperature collapse to a single sharp line at high temperature. The equation of Piette and Anderson (1959) was used and values JH+ = 9 0 0-2 kcal mole and A>S=i= = —7-9 + 1 e.u. were obtained with the assumption (8 —8 ) = 18-2 e.p.s. at 40 Mc/s from the earlier study. Agreement with the first study was satisfactory and a negative entropy of activation suggested. 

Ja,a, are now all H-D coupling and first order. These cause unresolvable splittings to occur which were removed by a strong irradiation at the deuterium resonance frequency (Bloom and Shoolery, 1955), Both of these studies of deuteriated cyclohexane are in agreement and suggest a virtually temperature-independent AG+ value of 10-3-10-5 kcal mole , JH+ = 10-9 + 0-6 kcal mole and AS+ = 2-9 + 2-3 e.u. A transmission coefficient of 0-5 is assumed in the inversion process. The r ults obtained by Harris and Sheppard (1961) have been recalculated and the values of JH+ and AS= now agree with the results on deuteriated cyclohexane. 

Figure 8.5 Infrared spectrum of testosterone (cf. SAQ 8.1). Reprinted from Spectrochim. Acta, 43A, Fletton, R. A., Harris, R. K., Kenwright, A. M., Lancaster, R. W., Pacher, K. J. and Sheppard, N., A comparative Spectroscopic investigation of three pseudopolymorphs of testosterone using sohd-state IR and high resolution solid-state NMR , 1111-1120, Copyright (1987), with permission from Elsevier.

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