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Synthesis and characterisation of two azobenzene modified 1,3-calix[4]-bis-crowns as artificial potentially allosteric systems

โœ Scribed by Mohamed Saadioui; Zouhair Asfari; Jacques Vicens

Publisher
Elsevier Science
Year
1997
Tongue
French
Weight
235 KB
Volume
38
Category
Article
ISSN
0040-4039

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โœฆ Synopsis

Azo calix[4]

crownsl-[2,2'] and 1-[4,4'] have been synthetized consisting in unsymmetrical 1,3-calix[4]-bis-crowns combining one polyether crown-6 and one azobenzene modified crown-6, Oattached at each side of a calix[4]arene in the 1,3-alternate conformation. Preliminary complexation of alkalis and ammonium #crates showed the cations to be located in the unmodified crown ether of the 1:1 complexes. Complexation induced changes in the transdcis ratio of the azobenzene unit of 1-14,4'] by an allosteric mechanism probably due to conformational changes.

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โœ Guo-Ping Xue; Jerald S. Bradshaw; Ning Su; Krzysztof E. Krakowiak; Paul B. Savag ๐Ÿ“‚ Article ๐Ÿ“… 2000 ๐Ÿ› Journal of Heterocyclic Chemistry ๐ŸŒ English โš– 214 KB

## Abstract Syntheses of 1,3โ€“2,4โ€calix[4]bisโ€crown ethers (**1** and **2**) fixed in the 1,3โ€alternate conformation by 1,3โ€ and 2,4โ€bridges made of two modified polyether chains each containing two 1,2โ€phenylene residues and one pyridine or anisyl unit are reported. The structures of compounds **1*