Novel [3]ferrocenophanes: Syntheses, redox properties and molecular structures of [Fe{(η5-C5H4)CMe2}2PR] (R=Ph, Cy)
摘要:
6,6-Dimethylfulvene reacts with Li2PR to give Li-2[{(C5H4)CMe2}(2)PR] [R =Ph (1), Cy (2)]. The ferrocenophanes [Fe{(eta(5)- C5H4)CMe2}(2)PR] [R = Ph (3), Cy (4)] are obtained in good yield from the lithium reagents I and 2 and FeCl2. Compounds 3 and 4 were characterised spectroscopically (H-1, C-13, P-31, IR, MS), and by crystal structure determination. Electrochemical investigation shows that 3 undergoes a one-electron oxidation in CH2Cl2 solution, which is chemically reversible on the short timescale of cyclic voltammetry, but in the longer time frame of macroelectrolysis the monocation [3](+) forms a new species that we tentatively assign as [Fe{(eta(5)-C5H4)CMe2}(2)P(O)Ph]. (c) 2005 Elsevier Ltd. All rights reserved.