The reaction of optically pure 1-(trifluoromethyl)cyclohexa-1,3-diene-5,6-diol with Fe2(CO)9 proceeds stereospecifically to give the endo complex 4, which was characterized by single-crystal X-ray structure determination; the trifluoromethyl group in 4 is found to be an excellent regiodirector during hydride abstraction and dehydroxylation reactions of 4.