Reaction of [Cr(CO)3(C8H8)] with CH3COCl–AlCl3 at 0 °C in CH2Cl2 yields, after hydrolysis, [Cr(CO)3(trans-PhCH![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CHCOCH3)]. Hydrogenation of the complex yields tricarbonyl(cyclo-octa-1,3,5-triene)chromium. The variable-temperature 1H n.m.r. spectra of [Cr(CO)3(MeC8H7)] and [Cr(CO)3(PhC8H7)] indicate that the substituent is on the unto-ordinated double bond in each case.
P. Hackett, B. F. G. Johnson and J. Lewis, J. Chem. Soc., Dalton Trans., 1982, 603 DOI: 10.1039/DT9820000603
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