Vk. Aggarwal et al., FIRST SYNTHESIS AND X-RAY CRYSTAL-STRUCTURE OF 1,2-(1,1'-FERROCENEDIYL)ETHENE, Journal of organometallic chemistry, 524(1-2), 1996, pp. 263-266
The ethene-bridged ferrocenophane, 1,2-(1,1'-ferrocenediyl)ethene, has
been prepared in six steps from ferrocene using a Stevens rearrangeme
nt as the key step to construct the strained bridge.