Zobrazeno 1 - 10
of 81
pro vyhledávání: '"Roland Spitzner"'
Autor:
Roland Spitzner, Joachim Reinhold, Wolfram Oelssner, František Hartl, Frank Schumer, Werner Schroth, Horst Hennig, Heiner Kaden
Publikováno v:
The Journal of Physical Chemistry. A, 110(5), 2039-2044. American Chemical Society
One-electron oxidation of 3,6-diphenyl-1,2-dithiin yields the corresponding radical cation. The product is stable at low temperatures and can be distinguished by a triplet EPR signal. Cyclic voltammetric, UV-vis spectroelectrochemical, and DFT studie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::27835aa0f72a0d9d5d3dd65d833fafbd
https://doi.org/10.1021/jp0551059
https://doi.org/10.1021/jp0551059
Publikováno v:
European Journal of Organic Chemistry. 1998:2365-2371
Whereas 3,4-bis(p-dimethylaminophenyl)-1,2-dithiete (18) is in equilibrium with its ring-opened valence isomer 19/19′, which can also exist as a solid, the analogously disubstituted 1,2-dithiin 20 is stable when protected from light, but on exposur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::598502a059baf24840a41fe0b288db21
https://doi.org/10.1002/(sici)1099-0690(199811)1998:11<2365::aid-ejoc2365>3.0.co
https://doi.org/10.1002/(sici)1099-0690(199811)1998:11<2365::aid-ejoc2365>3.0.co
Publikováno v:
Tetrahedron. 53:7509-7528
Various thieno[3,2-c] anellated (5a, 26) and dithieno[3,2-c:2,3-e] anellated 1,2-dithiins (32 a-c, 45) were obtained starting from appropriate thiophene precursors. The absorption maxima covered the range from 430 to 467 nm indicating olefinic rather
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::30807f4d766d78e8e3925777f673f627
https://doi.org/10.1016/s0040-4020(97)00439-0
https://doi.org/10.1016/s0040-4020(97)00439-0
Autor:
Almut Vogt, Dieter Ströhl, Rainer Herzschuh, Thomas Jende, Joachim Sieler, Werner Schroth, Simona Dunger, Gunter Israel, Frank Billig, Roland Spitzner, Jens Barche
Publikováno v:
Tetrahedron. 52:12677-12698
Various monocyclic 1,2-dithiines 6a,b,d-t were prepared via (Z,Z)-1,4-difunctionalized butadienes (4–11,19,20). A twisted cyclic structure A is unequivocally proved rather than of the ringopened valence isomer B. The reactivity of these 1,2-dithiin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c23534c5d184b1aafbd551f7287aef1
https://doi.org/10.1016/0040-4020(96)00752-1
https://doi.org/10.1016/0040-4020(96)00752-1
Publikováno v:
Tetrahedron. 51:13247-13260
The title compound 3, derived from (+)-camphor, allows preparatively useful conversions to be carried out at the 3,3′-bibornane skeleton. The reactions are characterized by steric factors. Despite the increasing steric strain in the bicyclic units,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c3d1f430b26876b4edfd6ebe84eaa38
https://doi.org/10.1016/0040-4020(95)00852-y
https://doi.org/10.1016/0040-4020(95)00852-y
Publikováno v:
Tetrahedron. 51:13261-13270
3- exo ,3′- exo -(1 R ,1′ R )-bicamphor ( 12 ) is obtained from 3- exo ,3′- exo -(1 R ,1′ R )-bithtiocamphor ( 3 ) by condensation with hydrazine hydrate followed by hydrolysis of the resulting dihydropyridazine 11 . Deprotonation of 12 with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6214d23631973a76162fe1169bd3ea62
https://doi.org/10.1016/0040-4020(95)00849-4
https://doi.org/10.1016/0040-4020(95)00849-4
Publikováno v:
Tetrahedron Letters. 36:1421-1424
Access to the title compounds ( 12–14 ) was achieved by two different syntheses starting from either phenylacetylene ( 1 ) or, from benzo[b]thiophene ( 2 ) by a reaction sequence formally equivalent to the insertion of sulfur. The key intermediates
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a49b459ad4a97854298a4ba9df44de3
https://doi.org/10.1016/0040-4039(95)00011-z
https://doi.org/10.1016/0040-4039(95)00011-z
Publikováno v:
Tetrahedron Letters. 35:1973-1976
The title compound 8 , obtained by oxidation of bis-thiocamphor 6 , represents a kinetically stabilized disulfide. Despite deeply colored, as usual in the 1,2-dithiine series, 8 displays various other features in strict contrast to the normal behavio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca38ea7f60e94f2f0c8c9890704bf51d
https://doi.org/10.1016/s0040-4039(00)73025-5
https://doi.org/10.1016/s0040-4039(00)73025-5
Publikováno v:
Tetrahedron Letters. 35:1977-1980
Thioxo- iso indigoide compounds E are accessible only in special cases, depending on the resonance situation in the heterocyclic unit, whereas the thioxo-indigoide species A are at all unknown. Thus the oxidation of the corresponding leuko- iso indig
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::44c2006ae32dee133cbe04239cb330d9
https://doi.org/10.1016/s0040-4039(00)73026-7
https://doi.org/10.1016/s0040-4039(00)73026-7
Publikováno v:
Journal of Physical Organic Chemistry. 6:489-493
Dipole moments of a series of 2,6-bis(dimethylamino) and 2,6-bis(pyrrolidino) derivatives of 4H-pyran-4-one (2), 4H-thiopyran-4-thione (3), 4H-pyran-4-thione (4) and 4H-thiopyran-4-thione (5) were determined in benzene and dioxane solutions at 25°C.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aef5d88bdcf37553909c9211e37fc751
https://doi.org/10.1002/poc.610060902
https://doi.org/10.1002/poc.610060902