Abstract
The reaction of anhydrous FeBr 2 with two equivalents of in situ generated anionic aryloxo-functionalized N-heterocyclic carbene [NaO-4,6-di-C(CH 3) 3-C 6H 2-2-CH 2{C(NCHCHNR)}] (R = CH(CH 3) 2, NaL 1; R = CH 2Ph, NaL 2) affords two bis-ligand Fe(II) complexes FeL 2 1 ( 1) and FeL 2 2 ( 2) in good yield, respectively. Attempt to synthesize mono-ligand Fe(II) bromide by the 1:1 molar ratio of NaL to FeBr 2 is unsuccessful, the same complexes of 1 and 2 were obtained. Both of 1 and 2 have been fully characterized by elemental analysis, 1H NMR spectra and X-ray structure determination. Preliminary studies show that 1 can catalyze the ring-opening polymerization of ε-caprolactone as a single component catalyst. The mechanism of the present ROP of ε-caprolactone has been investigated by the end group analysis.
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