Iron-based complex, preparation method thereof and method for preparing polycyclohexene oxide under catalysis of iron-based complex

[0054] Example 1

[0055] The present embodiment provides an iron-based complex, which is prepared by the following steps:

[0056] (1) Synthesis of Ligand-1: Under an argon atmosphere, a tetrahydrofuran (20mL) solution dissolved in 2-hydroxy-aniline (0.54g, 5mmol) was added to a tetrahydrofuran (20mL) solution dissolved in 2,4-dichloro-6-chloromethylphenol (2.56g, 10mmol) in a 100 mL reaction bottle, and then triethylamine (1.4mL, 10.07mmM) was added to the reaction bottle. The reaction is stopped after 10h of heating reflux, and the white precipitate is removed by filtration after cooling. Rotational evaporation removes the solvent to give a reddish-brown oily substance. By column chromatography (petroleum ether: ethyl acetate = 5:2), a white solid (1.6g, 70%), which was obtained 1 See H NMR spectra Figure 1A ， 13 See C NMR spectra Figure 1B , its ultraviolet spectra are seen Figure 5 ； 1 H NMR(500MHz,CDCl 3 )δ7.21(d,J＝2.5Hz,2H),7.15(dd,J＝7.9,1.3Hz,1H),7.05(td,J＝8.0,1.4Hz,1H),7.00

[0058] Example 2

[0059] The present embodiment provides an iron-based complex, which is prepared by the following steps:

[0060] (1) Ligand-2: In an argon atmosphere, the tetrahydrofuran (20mL) solution dissolved in 2-hydroxy-5-chloro-aniline (0.72g, 5mmol) was added to the tetrahydrofuran (20mL) solution dissolved in 2,4-dichloro-6-chloromethylphenol (2.56g, 10mmol) in a 100mL reaction bottle, and then triethylamine (1.4mL, 10.07mmol) was added to the reaction bottle. The reaction is stopped after 10h of heating reflux, and the white precipitate is removed by filtration after cooling. Rotational evaporation removes the solvent to give a reddish-brown oily substance. By column chromatography (petroleum ether: ethyl acetate = 2:1), a white solid (1.9g, 77%), which is obtained 1 See H NMR spectra Figure 2A ， 13 See C NMR spectra Figure 2B , its ultraviolet spectra are seen Figure 5 。 1 H NMR(500MHz,CDCl 3 )δ7.22(d,J＝2.3Hz,2H),7.15(d,J＝2.2Hz,1H),7.02(dd,J＝10.6,2.2Hz,3H),6.86(d,J＝8.6H

[0062] Example 3

[0063] The present embodiment provides an iron-based complex, which is prepared by the following steps:

[0064] (1) Ligand-3: In an argon atmosphere, a tetrahydrofuran (20mL) solution dissolved in 2-hydroxy-5-methyl-aniline (0.61g, 5mmol) was added to a tetrahydrofuran (20mL) solution dissolved in a 100 mL reaction bottle, and then triethylamine (1.4mL, 10.07mmol) was added to the reaction bottle. The reaction is stopped after 10h of heating reflux, and the white precipitate is removed by filtration after cooling. Rotational evaporation removes the solvent to give a reddish-brown oily substance. By column chromatography (petroleum ether: ethyl acetate = 2:1), a white solid (1.7g, 72%), thereof 1 See H NMR spectra Figure 3A ， 13 See C NMR spectra Figure 3B , its ultraviolet spectra are seen Figure 5 。 1 H NMR(500MHz,CDCl 3)δ7.20(d,J＝2.3Hz,2H),7.02–6.92(m,3H),6.83(dd,J＝18.0,8.1Hz,2H),4.11(s,4H),2.25(s,3H)； 13 C NMR(126MHz,CDCl 3 )δ149.61(s),149.13(s),134.84(s),129.