Zobrazeno 1 - 10
of 331
pro vyhledávání: '"A. S. Dreiding"'
Autor:
André S. Dreiding, Karl Wirth
Publikováno v:
Journal of Mathematical Chemistry. 52:1624-1638
The tetrahedron, fundamental in organic chemistry, is examined in view of two important kinds of angles: to each tetrahedron edge belongs a dihedral angle (internal intersection angle between two faces having the edge as common side) and to each tetr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d310f003e2a85c9b87518e103b0fa918
https://doi.org/10.1007/s10910-014-0342-0
https://doi.org/10.1007/s10910-014-0342-0
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 88:911-921
Experiments are presented which show that base treatment of the 7-halobicyclo-[3.2.0] hept-2-en-6-ols 1 to 4 produces ring contraction to the aldehydes 5 and 6, except in those cases of the isomer series 4 where the substituent on the endo-side of C(
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a6330980b594656fbcf86e50d850854
https://doi.org/10.1002/bscb.19790881112
https://doi.org/10.1002/bscb.19790881112
Autor:
Karl Wirth, André S. Dreiding
For a tetrahedron to actually exist, the edge lengths of each of its four faces evidently must obey the triangle inequality. This condition is necessary but not sufficent for six edge lengths to make up a tetrahedron. There does, for example, not exi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::886836894a2558934ce352723fb9a530
Autor:
Karl Wirth, André S. Dreiding
Worin unterscheidet sich eine rechte von einer linken Hand, trifft doch jede Eigenschaft der einen Hand auch auf die andere zu? Diese von Kant gestellte Frage und die von ihm gegebene Antwort waren immer wieder Anlass zu Kontroversen uber die Natur d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::378ee2c07bdbc270c77c34fcb496b94d
Publikováno v:
Caryophyllales ISBN: 9783642782220
The betalains, which include the red-violet betacyanins and the yellow betaxanthins (Fig. 10.1), represent a structurally and biosynthetically distinct class of naturally-occurring pigments. These pigments are found in flowering plants only in member
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0998ecd30de3ec08fa2471084b299f43
https://doi.org/10.1007/978-3-642-78220-6_11
https://doi.org/10.1007/978-3-642-78220-6_11
Publikováno v:
Helvetica Chimica Acta. 68:2238-2243
It is shown, in the case of the diketone 2, that chromatography with achiral phases of a non-racemic mixture of enantiomers can furnish fractions which differ in enantiomeric excess. Such chromatography may, therefore, be used to further enrich a sam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::297f6bb8b553bf7aff155a2a179f651f
https://doi.org/10.1002/hlca.19850680818
https://doi.org/10.1002/hlca.19850680818
Publikováno v:
Helvetica Chimica Acta. 63:2455-2468
Die Synthese von Stereoisomeren des Arteannuins B Wir beschreiben die Synthese von drei rac-Diastereomeren 7A-7C des Sesquiterpenlaktons Arteannuin B (I) auf dem in den Schemata 2 und 3 zusammengefassten Weg. Als Schlusselstufe fur den Aufbau des Rin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2255cbc5694fdba27b1edf5bb0eb26ef
https://doi.org/10.1002/hlca.19800630840
https://doi.org/10.1002/hlca.19800630840
Publikováno v:
Helvetica Chimica Acta. 65:2517-2525
The acetylene carbene rearrangement of three model a-alkynones, namely propynal (1a), 2-butynal (1b) and butynone (1c) is studied by ab initio double-zeta, double-zeta plus polarization and double-zeta plus self-consistent electron pairs calculations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::705ebe61ce45e8b12ccb8b77af470856
https://doi.org/10.1002/hlca.19820650821
https://doi.org/10.1002/hlca.19820650821
Publikováno v:
Helvetica Chimica Acta. 69:1734-1741
Butanolides and Butenolides by Intramolecular Ene-Reaction during Thermolysis of Propargyl Propiolates Gas-phase flow thermolysis of 2-butynyl propynoate (1) and 2-propynyl 2-butynoate (2) at 550° afforded 3-ethynyl-2-methyl-2-buten-4-olide (4, 85%)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c039b0e95c82ad24ecfcdb731bccda81
https://doi.org/10.1002/hlca.19860690730
https://doi.org/10.1002/hlca.19860690730