Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Hans Fritz"'
Autor:
Hans Fritz, Hanspeter Sauter, Paul Hug, Sven-Olov Lawesson, Tammo Winkler, B. S. Pedersen, S. Scheibye, Enno Logemann
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 87:525-534
By a new thiation reagent,1, 4, 11 the dimer of p-methoxyphenylthionophosphine sulfide, 3, a series of thioamides have been prepared in almost quantitative yields from the corresponding amides, Carbon-13 NMR spectra of tertiary thioamides of formic,
Publikováno v:
Journal für praktische Chemie. 342:819-824
Upon treatment with aqueous alkali, the Diels—Alder adducts 2 and 4 of dichloromethylenepropane-dinitrile (1) with cyclopentadiene and anthracene resp. are converted into 3-chloro-bicyclo[2.2.1]hepta-2,5-diene-2-carbonitrile (3) and 12-chloro-9,10-
Autor:
Hans Fritz, Meinrad Lugan, Gerhard Fischer, Dieter Hunkler, Kai Exner, Horst Prinzbach, Manfred Keller, Lothar Knothe
Publikováno v:
European Journal of Organic Chemistry. 2000:787-806
Of two very proximate syn-periplanar bisdiazenes (1,2) mono-, di-, tri- and tetra-N-oxides were prepared, representing six combinations of the individual NN/NNO/ONNO chromophores. According to DFT calculations (B3LYP/6-31G*), [2+2]photocycloaddition
Autor:
Emmerich Sackers, Andreas Weiler, Hans Fritz, Johann-Peter Melder, Dieter Hunkler, Horst Prinzbach, Klaus Weber
Publikováno v:
Research on Chemical Intermediates. 22:667-702
Methodological alternatives for the preparation of highly strained, highly pyramidalized dodecahedrene 2 (Estr=87.3 kcal mol−1; ϕ=43.5°, MM2) and 1,16-dodecahedradiene 3 (Estr=105.3 kcal mol−1; ϕ=42.9°, MM2) have been explored, protection/dep
Autor:
Hans Fritz, Bulusu A. R. C. Murty, Wolf-Dieter Fessner, Paul R. Spurr, Georg Lutz, Rolf Pinkos, Dieter Hunkler, Horst Prinzbach
Publikováno v:
ChemInform. 23
In bissecododecahedra-1,10(11)-dienes, the syn-periplanar and unusually proximate arrangement of the π bonds is responsible for extraordinary physical properties such as strong throughspace homoconjugation, low oxidation potentials, and a special re
Autor:
Hans Fritz, Horst Prinzbach, Paul R. Spurr, Johann-Peter Melder, Wolf-Dieter Fessner, Rolf Pinkos, Bulusu A. R. C. Murty
Publikováno v:
ChemInform. 23
Three conceptual routes (A, B, C) from [1.1.1.1]pagodane (1) to pentagonal dodecahedrane (2) are evaluated by MM2 (MM3) calculations. After limited experimental success with a catalytic one-pot route (A), a more selective transformation along one of
Publikováno v:
Journal of the American Chemical Society. 114:10213-10231
Pentagonal dodecahedranes with four, six, and eight skeletal positions being functionalized are made available from dimethyl 14,19-dioxopagodane-4-syn,9-syn-dicarboxylate 7 as a common precursor. Key steps are the installation of the two carbonyl fun
Autor:
Hans Fritz, Dieter Hunkler, Horst Prinzbach, Paul R. Spurr, Wolf-Dieter Fessner, Georg Lutz, Rolf Pinkos, Bulusu A. R. C. Murty
Publikováno v:
Chemische Berichte. 125:1719-1739
In bissecododecahedra-1,10(11)-dienes, the syn-periplanar and unusually proximate arrangement of the π bonds is responsible for extraordinary physical properties such as strong throughspace homoconjugation, low oxidation potentials, and a special re
Autor:
Wolf-Dieter Fessner, Horst Prinzbach, Rolf Pinkos, Bulusu A. R. C. Murty, Paul R. Spurr, Hans Fritz, Johann-Peter Melder
Publikováno v:
Chemische Berichte. 125:1697-1717
Three conceptual routes (A, B, C) from [1.1.1.1]pagodane (1) to pentagonal dodecahedrane (2) are evaluated by MM2 (MM3) calculations. After limited experimental success with a catalytic one-pot route (A), a more selective transformation along one of
Publikováno v:
Angewandte Chemie International Edition in English. 29:95-99