The products of Friedel–Crafts acetylation of tricarbonyl(cyclo-octatetraene)chromium
Abstract
Reaction of [Cr(CO)3(C8H8)] with CH3COCl–AlCl3 at 0 °C in CH2Cl2 yields, after hydrolysis, [Cr(CO)3(trans-PhCHCHCOCH3)]. 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.