keywords CHROMIUM TRICARBONYL COMPLEXES Chemistry Chemistry, Multidisciplinary EHMO and DFT calculations ETA(6),ETA(6)-HAPTOTROPIC REARRANGEMENTS EXPERIMENTAL NMR METAL-STABILIZED CARBANIONS MOLECULAR-DYNAMICS ORGANOMETALLIC COMPLEXES PI-COMPLEXES Physical Sciences SILATROPIC SHIFTS Science & Technology THEORETICAL DFT TRANSITION-STATES dibenzpentalenes organometallic migrations