After the reaction, we quenched the carbazole derivatives with a high concentration of ammonia washed with distilled water and sodium chloride. We then extracted the quenched, washed, and salt-washed solutions with dichloromethane, collected the organic layer in the lower layer of the separating funnel, and removed the water layer. Anhydrous magnesium sulfate was added to the extracted solution to remove residual water, and the gray-brown solid sample was filtered and dried. We calculated the yields of carbazole derivatives as follows:
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