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- W1967636660 abstract "Eine neue Zweistufensynthese zu den stark ringgespannten, helicalen Oxa[2.2]phanen 1–5 und eine systematische Reihe neuer strukturisomerer (2,4)-Pyridinophane (6–10) werden vorgestellt. Die Energiebarrieren für die Ringinversion der intermediären [3.2]Phane und die Racemisierungskinetik der [2.2]Phane werden gemessen. Racematspaltungen bzw. -anreicherungen gelingen durch HPLC and Cellulose-tris(3,5-dimethylphenyl)carbamat und Poly(triphenylmethyl-methacrylat). Die Circulardichroismen der strukturisomeren Zehnringe und der protonierten Pyridinium-Verbindungen werden gemessen. Die Auswirkung der Chromophor-Orientierung auf den Circulardichroismus wird vergleichend erörtert. Helical and Planar-chiral Pyridinophanes – A New Synthesis and Structure/Chiroptic Relationships A new two-step synthesis for the strained helical oxa[2.2]phanes 1–5 and for a systematic series of novel structural isomeric (2,4)-pyridinophanes (6–10) is presented. The energy barriers for ring inversion of some intermediate [3.2]phanes and the kinetics of racemization of the [2.2]phanes are determined. Separation and enrichment of enantiomers is achieved by HPLC on cellulose tris(3,5-dimethylphenyl)carbamate and poly(triphenylmethylmethacrylate), resp. The circular dichroism curves of the isomers are compared with those of the corresponding protonated pyridinium compounds. The influence of the chromophor orientation on the circular dichroism is discussed." @default.
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- W1967636660 date "1989-02-01" @default.
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- W1967636660 title "Helicale und planarchirale Pyridinophane – Neue Synthesemethodik und Struktur‐Chiroptik‐Beziehungen" @default.
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- W1967636660 doi "https://doi.org/10.1002/cber.19891220224" @default.
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