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Synthesis and Electron-Diffraction Structure of all-cis-[5.5.5.5]Fenestrane

✍ Scribed by Jan Brunvoll; Régine Guidetti-Grept; Istvan Hargittai; Reinhart Keese

Publisher
John Wiley and Sons
Year
1993
Tongue
German
Weight
505 KB
Volume
76
Category
Article
ISSN
0018-019X

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✦ Synopsis

The efficient synthesis of all-cis-[5.5.5.5]fenestrane (2) from the readily available intermediate 3 allowed the electron-diffraction analysis of 2. This structure analysis revealed long C-C bonds in the central C(C), fragment and a twist-envelope conformation for the four cyclopentane substructures. The four bridgehead H-atoms are in a synclinal rather than an ecliptic position with an approximate D, symmetry of 2. Planarizing distortions are evident from the opposite bond angles at the central C-atom being 116.2 0.5" with the remaining four being 103.7 i 0.2".

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