91031-00-4Relevant academic research and scientific papers
η3:η1 η2-TAUTOMERISM IN CARBONYLIRON COMPLEXES. INFLUENCE OF SUBSTITUENTS
Rybin, L. V.,Stelzer, N. A.,Garbusova, I. A.,Lokshin, B. V.,Rybinskaya, M. I.
, p. 295 - 304 (2007/10/02)
A number of chelate η3-allylcarbamoyl iron complexes (1) with different substituents (R in the allyl ligand and R' at the nitrogen atom) were synthesized.The influence of structural features on the equilibrium between the complexes I and their η2-azadiene tautomers (II) was studied by IR spectroscopy.It was established that the equilibrium position is determined in the first place by steric factors.When R is a bulky substituent the equilibrium is shifted towards the cyclic form I, whereas the branching of the alkyl substituent R' at the nitrogen atom favours the open olefinic form II.Furthermore ?-?-(N) rearrangement of complexes II to ?-(N) derivatives (III), and the conversion of III into η4-azadiene complexes (IV) also depend on the steric requirements of the substituents R and R'.
