Add time:09/08/2019 Source:sciencedirect.com
Short three or four step syntheses of N-[2-(2-hydroxyethoxy)ethyl]-substituted polyaza-crowns and cyclams without the need for a hydroxy blocking group are presented. Cyclization of a hydroxy-substituted diamine took place on the two amine nitrogen atoms because sodium carbonate does not ionize the hydroxy group.
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