Oxygen-bridged tetranuclear amidino aluminum catalyst as well as preparation method and application thereof
A tetranuclear amidine aluminum and catalyst technology is applied in chemical instruments and methods, preparation of oxygen-containing functional groups reduction, catalysts for physical/chemical processes, etc. Achieve the effect of large steric hindrance, mild catalytic conditions and simple preparation process
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Embodiment 1
[0018] A kind of tetranuclear amidinate aluminum catalyst of oxygen bridging in the present embodiment, its structural formula is:
[0019]
[0020] Wherein, Ar is 2,6-dimethylphenyl.
[0021] The method for the tetranuclear amidino-aluminum catalyst of described oxygen bridge, comprises the following steps:
[0022] Under the protection of an inert gas, a toluene solution of trimethylaluminum (2M, 2.0mL, 4.00mmol) was first added to N-phenyl-N'-(2,6-dimethyl)phenylcarbodiimide ( 0.444g, 2.0mmol) in toluene solution, stirred at room temperature for 4 hours to obtain a yellow clear solution, then the yellow clear solution was slowly dripped into the reaction solution with water (0.036g, 2.0mmol ), the reaction continued to stir for 1 hour after returning to room temperature, filtered, concentrated the filtrate in vacuo, placed 2 days at a temperature of 0°C, and separated out a colorless transparent crystal that was the tetranuclear amidinate aluminum catalyst of oxygen bri...
Embodiment 2
[0026] The structure of the oxygen-bridged tetranuclear amidinoaluminum catalyst in this example is the same as that in Example 1.
[0027] The method for the tetranuclear amidino-aluminum catalyst of described oxygen bridge, comprises the following steps:
[0028] Under the protection of an inert gas, a toluene solution of trimethylaluminum (2M, 2.0mL, 4.00mmol) was first added to N-phenyl-N'-(2,6-dimethyl)phenylcarbodiimide ( 0.444g, 2.0mmol) in the toluene solution, stirred at room temperature for 8 hours to obtain a yellow clear solution, then the yellow clear solution was slowly dripped into the reaction solution with water (0.036g, 2.0mmol ), the reaction continued to stir for 2 hours after returning to room temperature, filtered, and the filtrate was concentrated in vacuo, placed at a temperature of -20°C for 5 days, and a colorless transparent crystal was precipitated, which was the tetranuclear amidinate aluminum catalyst of oxygen bridge, and the yield was 70 %.
Embodiment 3
[0030] The structure of the oxygen-bridged tetranuclear amidinoaluminum catalyst in this example is the same as that in Example 1.
[0031] The method for the tetranuclear amidino-aluminum catalyst of described oxygen bridge, comprises the following steps:
[0032] Under the protection of an inert gas, a toluene solution of trimethylaluminum (2M, 2.0mL, 4.00mmol) was first added to N-phenyl-N'-(2,6-dimethyl)phenylcarbodiimide ( 0.444g, 2.0mmol) in toluene solution, stirred at room temperature for 6 hours to obtain a yellow clear solution, then the yellow clear solution was slowly dripped into the reaction solution with water (0.036g, 2.0mmol ), the reaction continued to stir for 1.5 hours after returning to room temperature, filtered, and the filtrate was concentrated in vacuo, and placed for 3 days at a temperature of 5° C., and a colorless transparent crystal was separated out, which was the tetranuclear amidinate aluminum catalyst of oxygen bridge, and the productive rate w...
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