N. Morita et al., THE SYNTHESIS OF TRICARBONYL(2,4-CYCLOHEPTADIENE-1,6-DIONE)IRON AND TRICARBONYL(2,4-CYCLOOCTADIENE-1,6-DIONE)IRON, Journal of organometallic chemistry, 460(1), 1993, pp. 67-72
ricarbonyl(6-hydroxy-2,4-cycloheptadien-1-one)iron derived from tricar
bonyl(tropone)iron was easily oxidized to give tricarbonyl(2,4-cyclohe
ptadiene-1,6-dione)iron. This procedure was also extended to tricarbon
yl(2-substituted tropone)iron and (bicyclo[5.1.0]octa-3,5-dien-2-one)t
ricarbonyliron to yield tricarbonyl(2-substituted 2,4-cycloheptadiene-
1,6-dione)iron and tricarbonyl(2,4-cyclooctadiene-1,6-dione)iron, resp
ectively.