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Rate constants for the reactions of N 2 + Fe(CO) 3 , N 2 + Fe(CO) 4 , CO + Fe(CO) 3 (N 2 ), N(C 2 H 5 ) 3 + Fe(CO) 3 , and N(C 2 H 5 ) 3 + Fe(CO) 4 are reported. The magnitudes of these rate constants are compared to rate constants for other reactions of Fe(CO) 3 and Fe(CO) 4 in the gas phase. The aforementioned reactions involving Fe(CO) 4 and Fe(CO) 3 (N 2 ) are anticipated to be formally spin disallowed. Factors that could influence the magnitude of the rate constants in these systems are discussed.