Synthesis of unsymmetrical calix[4]arene cryptand crown-6 in 1,3-alternate conformation
β Scribed by Buncha Pulpoka; Zouhair Asfari; Jacques Vicens
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- French
- Weight
- 201 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0040-4039
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π SIMILAR VOLUMES
New methods to obtain 1,2-bridged calix[4]arene-biscrowns in the 1,2-alternate conformation are described. The stereochemistry of the proximal double functionalization reaction is mainly governed by the solvent, the length of the polyether units and the base used to deprotonate the calix[4]arene.
calix[4] arene incorporating one diaza-tetraoxa-macrocyclic [18]-N204 subunit on each side of 1,3-alternate calix[4]arene framework, has been synthesized. The complexations of some alkali and ammonium cations by this macropentacycle have been studied by means of proton nuclear magnetic resonance sp
1,3-Alternate calix[4]-cyclen-benzo-crown-6 incorporating a cyclen subunit on one side and a benzocrown-6 on the other side of the calix[4]arene framework has been synthesized. Preliminary complexation studies of this macropolycycle with cesium and zinc picrate salts have been carried out by means o