Secondary dialkylamines were selectively acyl-CROWN ethers are widely applied in the complexation of ated in the presence of primary amines by complexation both inorganic and organic sa1ts.l 18-Crown4 is able to of the latter with 18-crown-6 and a proton source. complex primary alkylammonium salts by N-H . * 0 * Primary amide isolated as in d.12-crown-46 and a diazadioxaparacy~lophane.~
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