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• W1991569261 endingPage "1899" @default.
• W1991569261 startingPage "1893" @default.
• W1991569261 abstract "The first silicon-bridged [1.1]ferrocenophane, [{Fe(η-C5H4)2SiMe2}2]5, was prepared in five steps starting from [Fe(η-C5H4Li)2]·tmen (tmen =N,N,N′,N′-tetramethylethylenediamine). Reaction of [Fe(η-C5H4Li)2]·tmen with SiMe2Cl(NEt2) afforded [Fe{η-C5H4SiMe2(NEt2)}2]6 in high yield. Substitution of the silylamine groups of 6 for chlorine by reaction with acetyl chloride gave the dichloro species [Fe(η-C5H4SiMe2Cl)2]7 also in high yield. Reaction of 7 with Li(C5H5) in tetrahydrofuran produced the intermediate [Fe{η-C5H4SiMe2(C5H5)}2], which was subsequently lithiated and treated with FeCl2 to yield 5, in moderate yield. A single crystal X-ray diffraction analysis of compound 5 revealed that the two ferrocene halves are in an anti conformation, with a Fe ⋯ Fe distance of 5.171 (9)Å. Cyclic voltammetric analysis of 5 in CH2Cl2 showed the presence of two reversible oxidation waves with a separation of 0.25 V consistent with an extensive interaction between the Fe centres. The room-temperature 57Fe Mössbauer spectrum of 5 is similar to that of 1,1′-bis(trimethylsilyl)ferrocene with an isomer shift of 0.44(1) mm s–1 and a quadrupolar splitting value of 2.32(1) mm s–1. Compound 5 was found to be resistant to thermal ring-opening polymerization and attempted copolymerization with the strained silicon-bridged [1]ferrocenophane [Fe(η-C5H4)2SiMe2] also proved unsuccessful." @default.
• W1991569261 created "2016-06-24" @default.
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• W1991569261 date "1995-01-01" @default.
• W1991569261 modified "2023-10-11" @default.
• W1991569261 title "Synthesis, structural characterization, electrochemical properties and polymerization behaviour of the first silicon-bridged [1.1]ferrocenophane [{Fe(η-C₅H₄)₂SiMe₂}₂]" @default.
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• W1991569261 doi "https://doi.org/10.1039/dt9950001893" @default.
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