934 resultados para Homolytic aromatic substitution


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"Appendix 'A': Industries and processes on which women are employed." Report on women employed in iron and steel industries in Cleveland, Ohio, by Elizabeth Arnold.

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"Materials Central, Contract no. AF 33(616)-6480, Project no. 7340."

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Accompanied by "First- supplement." (v. diagrs. 28 cm.) New York, J. F. Rider [1951-

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Thesis (doctoral)--Ruprecht-Karls-Universitat zu Heidelberg, 1893.

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Thesis (doctoral)--Ruprecht-Carls-Universitat zu Heidelberg, 1892.

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Adsorption of p-cresol, nitrobenzene and p-nitrophenol on treated and untreated carbons is investigated systematically. The effects of carbon surface chemistry and solution pH are studied and discussed. All adsorption experiments were carried out in pH-controlled solutions to examine the adsorption properties of the adsorption systems where the solutes are in molecular as well as ionic forms. Using the homogeneous Langmuir equation, the single solute parameters are determined. These parameters are then used to predict the binary solute adsorption isotherms and gain further insights into the adsorption process. (C) 2002 Elsevier Science Ltd. All rights reserved.

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The 2,3,4-tri-toluenesulfonate ester derivatives of the methyl pyranosides of L-arabinose, D-ribose, D-lyxose, and D-xylose have been prepared, and their substitution reactions with various nucleophiles have been examined. For arabinose, xylose, and ribose, highly regioselective monosubstitutions were observed with benzoate, nitrite, and azide anions. These reactions have led to short and simple routes from D-xylose to L-arabinose derivatives, from L-arabinose to D-xylose derivatives, and from D-ribose to L-lyxose derivatives. The tritosylate derived from methyl alpha-D-lyxopyranoside was unreactive toward nucleophilic substitution reactions, giving instead a dihydropyran product arising from an initial E2 elimination reaction of the 2-tosylate.