ISSN:
1434-4475
Keywords:
1,2-Diferrocenylbutane (racemic and meso)
;
1,2-Diferrocenyl-1,2-diphenylethane (racemic and meso)
;
Tetraferrocenylethane
;
Conformations
;
13C-nmr spectroscopy
;
X-ray crystal structure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract X-ray crystal structure analyses of stereoisomeric 1,2-dimethyl and diphenyl 1,2-diferrocenyl ethanes (1,2) as well as of 1,1,2,2-tetraferrocenyl ethane (3) showed that racemic (threo) and meso (erythro)2 adopt conformations with antiperiplanar arrangement of the ethane H-atoms (andC 2 andC i symmetry, resp.), whereas1 and3 prefer the synclinal (skew) conformations. In3 the torsional angle between the ethane H-atoms is increased to appr. 90°;3 represents a chiral structure withC 2 symmetry. For the conformation of tetraferrocenyl ethane (3) in solutionC 2 symmetry could be deduced from the13C-nmr. spectra. The conformations of the diferrocenyl ethanes are discussed and compared with those of corresponding alkyl and aryl ethanes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00809018
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