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The mechanism of photochemical reactions in organometallic chemistry is investigated through state correlation diagrams based on the symmetry and spin properties and CI calculations of the corresponding potential energy curves. The following reactions will be considered: i) carbonyl elimination from $Fe(CO)5$; ii) photosubstitution in the $d6$ metal carbonyls; iii) hydrogen elimination in $HCo(CO)4$; iv) metal-metal bond cleavage in transition metal dimers.