Gauche-eclipsed

The conformation angle for the iron compound has been found to be 59.7°, virtually equivalent to the ideal value of 60 expected for the gauche-eclipsed orientation XXIV. It is particularly important that this eclipsed conformation was adopted despite the fact that substantial inter-ligand repulsions are present. There clearly must be a powerful elec-... 

Ag(N03)(/t-dppl)]2 doubly bridging gauche eclipsed anticlinal staggered 89.6... 

Rh2 (/2-S- Bu)2 (C0)2 (/2-dppf) quasi-closed bridge gauche eclipsed 72... 

Ag2(/t-CH3C02)(/t3-CH3C02)(/t-dppf)]2 quasi-closed bridge gauche eclipsed 88.8... 

Rej (/t-OMe)2 (CO)6(/t-dppf) quasi-closed bridge gauche eclipsed 85.9(5)... 

Fe3(/i3-S)2(CO)2(/r-dppf) quasi-closed bridge gauched eclipsed 80.4(5)... 

Fig. 9.15 Molecular structures of bis(2,4-dimethylpentadienyl)iron showing the favoured gauche eclipsed conformation of the ligands and of ri -Me2C li )2T]L (L = CO,...

Miscellaneous Complexes.—Bis(2,4-dimethylpentadienyl)iron is found to exist as an open sandwich (24) in which the methyl groups are interlocked and an essentially gauche-eclipsed conformation is adopted. The complex is considered to be a true structural analogue of ferrocene with the pentadienyl ligands being nearly planar and the iron-carbon distances varying from 2.071(3) A (2,4-positions) to 2.084(3) A (3-position) and 2.114(8) A (1,5-positions). 

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