Secondary dialkylammonium

Self-assembly of secondary dialkylammonium ions with macrocyclic polyethers and formation of pseudorotaxanes 96CC1483. 

M. C. T. Fyfe, J. F. Stoddart, (Supra)molecular Systems Based on Crown Ethers and Secondary Dialkylammonium Ions , Adv. Supramol Chem 1998, 5,1-53. 

Pseudorotaxanes and Rotaxanes Incorporating Macrocyclic Polyethers and Secondary Dialkylammonium Salts as their Components... 

Complexes formed between secondary dialkylammonium ions and crown ethers having fewer than 24 atoms in their macrocycles have been observed to occur in a face-to-face manner. See a. Metcalfe, J.C., Stoddart, J.F. and Jones, G. (1977) Journal of the American Chemical Society,... 

Secondary dialkylamines are selectively acylated in the presence of primary amines by complexation of the latter with 18-crown-6 and a proton source. As the cavity in 18-crown-6 is ca. 2.7 A , secondary dialkylammonium salts are less efficiently complexed. ... 

Complexes of primary alkylanunonium salts and secondary dialkylammonium salts have been observed with diazaparacyclophanes. ... 

Another wide family of purely organic interlocked systems has been developed by Stoddart s group, based on hydrogen bonding and on donor-acceptor interactions. Suitably sized crown ethers can form pseudorotaxane complexes with appropriate secondary dialkylammonium ions which rely on N —H - 0 and C—H - 0 hydrogen bonds for stabiUzation. Similarly, a r-electron rich component, in interaction with a r-electron deficient moiety (traditionally cyclobis(paraquat-p-phenylene), CBPQ T, 21, ... 

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