Abstract
On the Complex Chemistry of Cyclopentadienyl Ligands with Oligoethylene Glycol Ether TentaclesHerrn Professor Eckehard V. Dehmlow zum 60. Geburtstag gewidmet. The potassium cyclopentadienides KCp′[SiMe2(OCH2CH2)m1‐OCH3]n (2) react with trimethyltin chloride to give the respective stannanes Me3SnCp′[SiMe2(OCH2CH2)mOCH3]n (3a–e). Reaction of 2a–e with iron(II) chloride affords the ferrocenes Fe{Cp′[SiMe2(OCH2CH2)mOCH3]n}2 (4a–e), which are soluble in solvents of all polarities. 4a–d were investigated with respect to their ability to act as podands for alkaline metal cations. 4c, d prove to be much better podants than 4a, b; 4a, c show a certain selectivity for K+, 4b, d show a preference for Cs+. Without rigorous exclusion of moisture, 4e yeilds the tetrasiladioxa[3](1,1‐)[3](3,3‐)ferrocenophane 5 upon prolonged standing at room temperature. The structure of 5 was determined by a single‐crystal X‐ray diffraction study. The molecule is essentially unstrained with the cyclopentadienyl rings being exactly parallel to each other; the distance between the iron atom and the ring centroid is 165 pm.
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