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1.
The mass spectra of a number of griseofulvin analogues have been examined and the fragmentations, which are characteristic of the basic skeleton of the molecule, have been determined. In all of the different structural types examined, the ring cleavages which predominate are found tol occur by fission of one or more of the bonds attached to the spiro carbon atom. The degree of unsaturation in the spiro-cyclohexane ring system is found to controll the type of fragmentation which occurs and the type of ring system which is present can therefore be identified by its mass spectrum. 相似文献
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Trent D Lund Timothy W West Lilyan Y Tian Lihong H Bu Daniel L Simmons Kenneth DR Setchell Herman Adlercreutz Edwin D Lephart 《BMC neuroscience》2001,2(1):20-13
Background
In learning and memory tasks, requiring visual spatial memory (VSM), males exhibit superior performance to females (a difference attributed to the hormonal influence of estrogen). This study examined the influence of phytoestrogens (estrogen-like plant compounds) on VSM, utilizing radial arm-maze methods to examine varying aspects of memory. Additionally, brain phytoestrogen, calbindin (CALB), and cyclooxygenase-2 (COX-2) levels were determined. 相似文献4.
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P. Doyle I. Fenwick G. P. Savage 《The Journal of the Operational Research Society》1979,30(2):105-111
This paper describes a model developed for a British bank to assist management in establishing branch goals, evaluating performance and planning new locations. Econometric methods are used to produce a set of equations which effectively predicts the main dimensions of branch performance. 相似文献
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David T. Coxon Anthony M.C. Davies G.Roger Fenwick Ron Self John L. Firmin David Lipkin Norman F. Janes 《Tetrahedron letters》1980,21(5):495-498
Agropine, an unusual compound produced in plant tumours was shown by mass spectrometry and proton and carbon-13 nmr spectroscopy to be a bicyclic derivative of glutamic acid and a hexitol sugar. 相似文献
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Reaction of 2,4,6-trichloropyrimidine with sodium dibenzylmalonate in p-dioxane gave 4,6-dichloro-2-(dibenzylmalonyl)pyrimidine, while reaction of 2,4,6-trichloropyrimidine with sodium dimethylmalonate yielded both 4,6-dichloro-2-(dimethylmalonyl)pyrimidine and 2,2-bis-(4,6-dichloropyrimidin-2-yl)dimethylmalonate. Structural studies using nmr, ir and uv spectroscopy indicate that for the former two compounds in basic solvent, an equilibrium exists between the keto forms and resonance-stabilized enolate ions. 相似文献
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M. Dimitroff G. Spacu M. Entat E. Vulquin J. Herzog B. van der Burg C. A. Koppejan Erich Müller Florence Fenwick G. Torossian P. M. Dean E. Newcomer O. O. Watts L. A. Congdon W. B. Crabtree H. W. Coles L. L. Smith M. L. Vehalgo H. W. Doughty A. J. Jonas E. Oppenheimer L. J. Curtman C. Kaufman J. M. Kolthoff N. Sasaki J. H. Linschoten V. Thüringer S. Hasselskog H. T. S. Britton F. L. Hibbard 《Analytical and bioanalytical chemistry》1927,72(9-10):375-386
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