Reaction of dicarbonyl ( pentahapto-cyclopentadienyl)(olefin)iron cations with sodium azide

Abstract

Reaction of the ( h 5-C 5H 5)Fe(CO) 2(C 2H 4) cation with sodium azide yields the azido complex ( h 5-C 5H 5)Fe(CO) 2N 3 by ligand displacement, rather than the isocyanate complex ( h 5-C 5H 5)Fe(CO)(C 2H 4(NCO) as had previously been reported. The azido complex may also be obtained from other ( h 5-C 5H 5)Fe(CO) 2(olefin) cations or in low yield from ( h 5-C 5H 5)Fe(CO) 2Cl. The azido complex is converted to the isocyanate complex ( h 5-C 5H 5)Fe(CO) 2(NCO) in low yield by photolysis, and to a triazole complex on treatment with dimethyl acetylenedicarboxylate.