953 resultados para Substitution homolitique aromatique


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München, Phil. Diss. v. 20. Dez. 1910, Ref. v. Baeyer.

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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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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.

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Wurst is a protein threading program with an emphasis on high quality sequence to structure alignments (http://www.zbh.uni-hamburg.de/wurst). Submitted sequences are aligned to each of about 3000 templates with a conventional dynamic programming algorithm, but using a score function with sophisticated structure and sequence terms. The structure terms are a log-odds probability of sequence to structure fragment compatibility, obtained from a Bayesian classification procedure. A simplex optimization was used to optimize the sequence-based terms for the goal of alignment and model quality and to balance the sequence and structural contributions against each other. Both sequence and structural terms operate with sequence profiles.