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Cyclisation of diferrocenylbutadiyne dicobalt hexacarbonyl mono-adduct to novel ferrocenotropones

2004; Elsevier BV; Volume: 690; Issue: 3 Linguagem: Inglês

10.1016/j.jorganchem.2004.08.050

1872-8561

Gerhard Laus, Herwig Schottenberger, J. Lukasser, Klaus Wurst, Johannes Schütz, K.‐H. Ongania, László Zsolnai,

Coordination Chemistry and Organometallics

Treatment of 1,4-diferrocenyl-1,3-butadiyne dicobalt hexacarbonyl complex (1) [CARN: 178388-65-3] with trifluoroacetic acid resulted in cyclisation with concomitant CO insertion to give the green 2,3-ferroceno-7-ferrocenyl-4,5-dehydrotropone dicobalt hexacarbonyl (2), which in turn was converted by trifluoroacetic acid to red 2,3-ferroceno-7-ferrocenyltropone (3). The first step implied the involvement of a second dicobalt hexacarbonyl complex as a CO source. The molecular structures of 2 and 3 were determined by single crystal X-ray analysis, and pairs of enantiomers with different conformations were observed in 3.