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Synthesis, Properties and Formation of (RCp)Co- and (RCp)Rh-Stabilized[4.8]3Cyclacene Derivatives

✍ Scribed by Stefan C. Kornmayer; Björn Hellbach; Frank Rominger; Rolf Gleiter

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 779 KB
Volume: 15
Category: Article
ISSN: 0947-6539
DOI: 10.1002/chem.200802455

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✦ Synopsis

Abstract

Metal‐stabilized belts: A torus, 3, consisting of three four‐ and three eight‐membered conjugated rings and stabilized by (RCp)Co‐ and (RCp)Rh‐ units, was generated by irradiation of [(RCp)Co(CO)~2~] and [(RCp)Rh(C~2~H~4~)~2~], respectively, and 1.magnified image

Eleven metal stabilized [4.8]~3~cyclacene derivatives were synthesized. The substances were prepared in one‐pot reactions by irradiation of a solution of 5,6,11,12‐tetradehydro‐dibenzo[a,e]cyclooctatetraene and the corresponding cobalt reagents or rhodium compounds. The resulting cyclacene derivatives reveal D~3__h__~ symmetry in solution. In the solid state the hoop shaped systems crystallize in layers, which are intercalated with solvent layers. To unravel the mechanism of the one‐pot reaction we isolated an intermediate, which shows almost planar cyclooctatetraene rings.

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