S y n t h e s i s o f ( B r o m o -h 4 -2 -p y r o n e ) t r i c a r b o n y l i r o n C o m p l e x e sAbstract: The addition of the tricarbonyliron 'Fe(CO) 3 ' unit to several bromo-substituted 2-pyrones has been investigated. Direct reaction with Fe 2 (CO) 9 in benzene at 80 ºC results in poor yields and hydrodebromination. Switching the solvent to n-Bu 2 O, sequential addition of Fe 2 (CO) 9 and slow passage of N 2 through the solution improves the yields of the tricarbonyliron complexed 2-pyrones. Direct 'Fe(CO) 3 ' transfer reagents such as (h 4 -benzylideneacetone)tricarbonyliron or generic (h 4 -1-azabuta-1,3-diene)tricarbonyliron complexes, under both stoichiometric and catalytic conditions, fails to give the desired complexes. Surprisingly, the unstable bis(h 2 -cis-cyclooctene)Fe(CO) 3 (Grevels' reagent) did serve as a useful transfer reagent.