Zobrazeno 1 - 8
of 8
pro vyhledávání: '"Manfred Schwertel"'
Publikováno v:
Zeitschrift für Naturforschung B. 68:1347-1355
1,2,5,6,9,10-Hexaalkoxyhexahelicenes 3 represent [3]star compounds with a helical core. A multistep synthetic concept for 3 is discussed, in which the final step 16→3 is a twofold oxidative photocyclization. The linearly conjugated compounds 16 con
Publikováno v:
Helvetica Chimica Acta. 96:2009-2019
Publikováno v:
Helvetica Chimica Acta. 96:2020-2032
C2-Symmetric hexahelicenes 3a–3g, which bear four or six alkoxy chains, were prepared in eight-to-nine reaction steps in high overall yields. The final step consisted of a twofold oxidative photocyclization of the corresponding 2,7-bis(2-phenylethe
Publikováno v:
ChemInform. 45
C2-Symmetric hexahelicenes 3a–3g, which bear four or six alkoxy chains, were prepared in eight-to-nine reaction steps in high overall yields. The final step consisted of a twofold oxidative photocyclization of the corresponding 2,7-bis(2-phenylethe
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 56:684-686
The crystal structures of the [6]helicenes 4,13-(1,10-decamethylenedioxy)hexahelicene, C36H34O2, (I), and 4,13-(1,8-octamethylenedioxy)hexahelicene, C34H30O2, (II), show strong steric interactions between the terminal benzene rings
Publikováno v:
Angewandte Chemie. 110:2224-2226
Drastisch erhoht die Verbruckung in den Hexahelicenophanen 1 (n=8, 10) die Racemisierungsgeschwindigkeit gegenuber der des unsubstituierten Grundkorpers [6]Helicen. Dieses unerwartete Ergebnis beruht auf sterischen Wechselwirkungen zwischen den Polym
Publikováno v:
ChemInform. 31
The crystal structures of the [6]helicenes 4,13-(1,10-decamethylenedioxy)hexahelicene, C36H34O2, (I), and 4,13-(1,8-octamethylenedioxy)hexahelicene, C34H30O2, (II), show strong steric interactions between the terminal benzene rings
Publikováno v:
Angewandte Chemie (International ed. in English). 37(15)
A drastic increase in the rate of racemization is found for the bridged hexahelicenophanes 1 (n=8, 10) relative to the unsubstituted parent [6]helicene. This unexpected result occurs from steric interactions between the polymethylenedioxy chains and