M. Sodeoka et al., CARBON-CARBON BOND-FORMING REACTION THROUGH A ETA(5)-PENTADIENYLCHROMIUM COMPLEX, Journal of organic chemistry, 59(4), 1994, pp. 712-714
Arene.Cr(CO)(3)-mediated coupling reactions of pentadienyl esters (7a-
d, 11, and 13) with carbonyl compounds via eta(5)-pentadienylchromium
intermediates gave the gamma-adducts regioselectively.