[123]Tetramantane: parent of a new family of sigma-helicenes.
J Am Chem Soc
; 131(32): 11292-3, 2009 Aug 19.
Article
em En
| MEDLINE
| ID: mdl-19722641
ABSTRACT
We present a new type of sigma-helical structure based on a diamondoid (nanodiamond) framework, C(2)-symmetric [123]tetramantane, whose (+) and (-) isomers could be enantioseparated by HPLC techniques. Bromination of the enantiopure hydrocarbon led to the isolation of (+)-7-bromo-[123]tetramantane, which could be crystallized and subjected to X-ray structure analysis. Using the anomalous dispersion, we have identified this compound as the P isomer for the hydrocarbon moiety. Experimental and computed optical rotatory dispersion (ORD) and vibrational circular dichroism (VCD) spectra independently and in agreement with the X-ray structure analysis gave M-(-) as the configuration of the second eluted parent hydrocarbon isomer.
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MEDLINE
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article