To a reflux apparatus add 8.6ml of salicylaldehyde, 20ml of benzene and then slowly add 2.7g of ethylene diamine dissolved in 5ml of benzene to the solution with stirring. Reflux for 2h, cool down in a freezer, filter and wash with some cold acetone. Recrystallize in hot DCM.
Refluxing the solution
Salen forming on reflux
Sample of the recrystallized product