Zobrazeno 1 - 10 of 14 pro vyhledávání: '"Christoph Sigwart"'
1
Preparation and Properties of Stelladiones
Autor: Holger Lange, Oliver Borzyk, Christoph Sigwart, Rolf Gleiter, Thomas Oeser, Bettina Gaa, Hermann Irngartinger, Frank Rominger
Publikováno v: European Journal of Organic Chemistry. 1998:171-176
Tricyclo[3.3.0.03,7]octane-2,4-dione (2,4-stelladione, 3), tricyclo[3.3.0.03,7]octane-2,6-dione (2,6-stelladione, 4), and 2-oxotricyclo[3.3.0.03,7]octane-6-thione (5) were synthesized. Key steps in the procedures were a Paterno-Buchi reaction followe
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::88f7cf0590e2baecea2be7cb1ce73cee
https://doi.org/10.1002/(sici)1099-0690(199801)1998:1<171::aid-ejoc171>3.0.co
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2
Interactions of π-systems via chains, rings and cages-syntheses of model compounds and their spectroscopic investigations
Autor: Christoph Sigwart, Thilo Herb, Rolf Gleiter, Oliver Borzyk
Publikováno v: Pure and Applied Chemistry. 68:233-238
The interactions between two x-systems separated by chains, rings and cages are discussed. The focus is on systems with a bicyclo(3.3.0.0~~7)octane skeleton (stellane) as building block. The syntheses of a number of model systems such as 2,6-stelladi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0716b0b6422c76d22b0413d270a9e354
https://doi.org/10.1351/pac199668020233
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3
Synthesis and Properties of 2,4,6-Trimethylenetricyclo[3.3.0.03,7]octane (Stellatriene) and Its Alkyl Derivatives. Candidates for a Two-Step Cope Rearrangement
Autor: Rolf Gleiter, Christoph Sigwart
Publikováno v: The Journal of Organic Chemistry. 59:1027-1038
The synthesis of 2,4,6-trimethylenetricyclo[3.3.0.0 3,7 ]octane (stellatriene, 9), its hexamethyl derivative 37, and the spirocyclic derivatives 67 and 68, substituted at the carbon atom of the saturated bridge of the tricyclic system, are described.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2caeb4a9e5a25b25a5ab592d4cd386c1
https://doi.org/10.1021/jo00084a019
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4
Electronic Interactions in Saturated and Unsaturated [1.1.1]‐, [2.1.1]‐, [2.2.1]‐, and [2.2.2]Triblattanes — PE‐Spectroscopic Investigations
Autor: Horst Prinzbach, Hermann Müller-Bötticher, Christoph Sigwart, Wolf-Dieter Fessner, Rolf Gleiter
Publikováno v: Chemische Berichte. 126:2299-2307
The He(I)-PE spectra of the parent [1.1.1]-, [2.1.1]-, [2.2.1]-, and [2.2.2]triblattanes 1–4, of their unsaturated or ketonic congeners 5–13 and benzo derivatives 14–20 have been recorded. For 1–4, the energy difference between the highest oc
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1eabc00b553768f16f7ab169123cb4c8
https://doi.org/10.1002/cber.19931261019
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5
Structures of four tricyclo[3.3.0.03,7]octanes and a 4-oxatetracyclo[4.2.1.0 2,5.03,7]nonane derivative
Autor: V. Siemund, Hermann Irngartinger, Bernd Kissler, Christoph Sigwart, Rolf Gleiter
Publikováno v: Acta Crystallographica Section C Crystal Structure Communications. 49:57-62
N,N-Dimethyl-6-methylenetricyclo[3.3.0.0 3,7 ]octane-2-carboxamide (1), C 12 H 17 NO, monoclinic, P2 1 /c, a=11.213 (2), b=6.168 (1), c=15.268 (3) A, β=95.07 (1) o , Z=4, T=298 K, final R=0.047 for 1782 observed reflections. 4,6-Diisopropylidenetric
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::27fe0faca8445a5fa672af68b0b3c3e0
https://doi.org/10.1107/s0108270192005936
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7
ChemInform Abstract: Synthesis and Properties of 2,4,6-Trimethylenetricyclo(3.3.0.03,7) octane (Stellatriene) and Its Alkyl Derivatives. Candidates for a Two- Step Cope Rearrangement
Autor: Rolf Gleiter, Christoph Sigwart
Publikováno v: ChemInform. 25
The synthesis of 2,4,6-trimethylenetricyclo[3.3.0.0 3,7 ]octane (stellatriene, 9), its hexamethyl derivative 37, and the spirocyclic derivatives 67 and 68, substituted at the carbon atom of the saturated bridge of the tricyclic system, are described.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::93cc1828504aafd167f2597e19993c98
https://doi.org/10.1002/chin.199432108
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8
ChemInform Abstract: Preparation and Properties of Stelladiones
Autor: Oliver Borzyk, Christoph Sigwart, Hermann Irngartinger, Rolf Gleiter, Thomas Oeser, Holger Lange, Frank Rominger, Bettina Gaa
Publikováno v: ChemInform. 29
Tricyclo[3.3.0.03,7]octane-2,4-dione (2,4-stelladione, 3), tricyclo[3.3.0.03,7]octane-2,6-dione (2,6-stelladione, 4), and 2-oxotricyclo[3.3.0.03,7]octane-6-thione (5) were synthesized. Key steps in the procedures were a Paterno-Buchi reaction followe
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b692566630bd767d6ad09ae18bcfe48f
https://doi.org/10.1002/chin.199814081
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10
cis,cis - Trialkyl-triaziridines photoelectron spectra - X-ray structural analysis
Autor: Wolfgang Marterer, Horst Prinzbach, Stefan Gries, Otmar Klingler, Christoph Sigwart, Hermann Irngartinger, Rolf Gleiter
Publikováno v: Tetrahedron Letters. 29:185-188
PE-analysis of three cis,cis-trialkyltriaziridines ( 1-3 ) reveals a relatively large Jahn-Teller effect (0.4 eV) for the 2 E state and a large split (2.5 eV) between the 2 E and 2 A 1 states indicating a strong interaction between the lone pairs. Fo
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fd21845cc9fa22ea33a2a33a4bb2394b
https://doi.org/10.1016/s0040-4039(00)80048-9
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