Benzo-21-crown-7/secondary dialkylammonium salt [2]pseudorotaxane- and [2]rotaxane-type threaded structures

Organic Letters

Volumn 9, Issue 26, 2007, Pages 5553-5556

  Zhang, Chuanju ^a   Li, Shijun ^a   Zhang, Jinqiang ^a   Zhu, Kelong ^a   Li, Ning ^a   Huang, Feihe ^a  

^a ZHEJIANG UNIVERSITY   (China)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 38349154959     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol702510c     Document Type: Article

References (45)

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43. 3a From these, we can know whether a complexation system is fast-exchange or slowexchange is mainly dependent on the relative sizes of the end groups of the guest.
44. -1 by proton NMR dilution in acetonitrile.
45. From Figure 3, it is obvious that the benzene ring of B21C7 is not a required part for the threading of secondary ammonium salts through the caviety of B21C7. Therefore, 21-crown-7, the corresponding crown ether without a benzene ring, should also be able to form threaded structures with secondary ammonium salts. Previously, Loeb et al. found that both of DB24C8 and 24-crown-8 can complex N-benzylanilinium salts (Loeb, S. J.; Tiburcio, J.; Vella. S. J. Org. Lett. 2005, 7, 4923-4926).