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With formic acid; In N,N-dimethyl-formamide; at 20℃; for 8h;Reflux;
1) 1mol melamine was weighed and dissolved in 60ml of DMF. The system was raised to 120C to completely dissolve under stirring. 2) 2mol <strong>[110677-45-7]4-(carbazol-9-yl)benzaldehyde</strong> was weighed and dissolved in 20ml of DMF at room temperature with stirring. 3) The solution obtained in step 2 was added dropwise to the step 1 solution. 0.01mol formic acid was added and refluxed for 8h. The reaction was completed. The final reaction product was removed of solvent by rotary evaporation and purified by column chromatography to isolate pure melamine polycondensated with carbazolbenzaldehyde double Schiff base.
With acetic acid; In dimethyl sulfoxide; at 20℃; for 1h;Reflux;
1), weighing 1mol melamine dissolved in 60 ml of in DMSO, make the system heating to 100 C, completely dissolved under agitation;2) weighing 0.8mol P of formaldehyde, the dissolved in 20 ml of in DMSO, at room temperature, stirring is dissolved;3) step 2 the resulting solution, is added dropwise to the step 1) in the preparation of the solution; and adding 0.01mol acetic acid, so that the system return 1h, reaction finishes; the final product of the reaction, to remove the solvent by the spin vaporization; and by column chromatography, separation to obtain pure melamine-formaldehyde shan Xifu P-alkali.
With acetic acid; In dimethyl sulfoxide; at 20 - 100℃; for 20h;
1), weighed 1mol melamine dissolved in 60ml of dimethyl sulfoxide, making the system temperature to 100 , completely dissolved in the stirring;2) 5 mol of carbazole benzaldehyde was weighed out, dissolved in 60 ml of dimethylsulfoxide, and dissolved by stirring at room temperature.3) adding the solution obtained in the step 2 to the solution prepared in the step 1); and adding 0.01 mol of acetic acid to make the system reflux for 20 hours, and the reaction is finished; the final product is evaporated to remove the solvent; Chromatography, separation of pure melamine tricarbazole benzaldehyde three Schiff base.
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