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Synthesis of azacalix[4]arene betaine

✍ Scribed by Hiroyuki Takemura; Youich Kozima; Takahiko Inazu

Book ID
104262013
Publisher
Elsevier Science
Year
1999
Tongue
French
Weight
220 KB
Volume
40
Category
Article
ISSN
0040-4039

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✦ Synopsis

Azacalix [4]arene betaine, which possesses intramolecular positive and negative charges, was synthesized. N,N'-Dimethylazacalix[4]arene was prepared by a simple procedure and subsequent N-quaternarization afforded the N,N,N',N'-tetramethyl diammonium compound. It was converted into the betaine structure in methanol at pH 9.

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## Abstract We describe the synthesis and spectrophotometric studies of novel N(H)‐azacalix[4]arenes. The unprecedented direct functionalization of the N(H) bridges furnished N(__R__)‐bridged aza[1~4~]calixarene **11** that could complex a neutral guest (CH~2~Cl~2~) or could be further reduced into