Synthesis of tert-butylcalix[4]arenes modified with germanium-containing side-chains at the lower rim

✍ Scribed by Takayuki Sakurai; Yoshito Takeuchi

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 202 KB
• Volume: 14
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.10164

✦ Synopsis

Abstract

Bis‐, tris‐, and tetrakis‐trimethylgermylpropanoyl esters of p‐tert‐butylcalix[4]arenes 5, 7, and 8 were synthesized and their conformations in solution were determined by ^1^H and ^13^C NMR spectroscopy. The characteristic pair of doublets from the ArCH~2~Ar methylene protons was observed, indicating that all the prepared calixarenes were in the cone conformation. These germylated calixarenes failed to exhibit any appreciable cation‐capturing ability, indicating that further modification is required to make these compounds to be effective ditopic hosts. © 2003 Wiley Periodicals, Inc. Heteroatom Chem 14:365–373, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10164