Ferrocenium salts mediate high yielding one-pot and convergent syntheses of para-tert-butylcalixarenes in mild non-Lewis or Brønsted acidic reaction conditions; EPR indicates complex formation between the s-trioxane and the ferrocenium salt.
Deprotonation of Large Calixarenes – Cation Binding and Conformations
作者:Jack M. Harrowfield、George A. Koutsantonis、Mark I. Ogden、Alexandre N. Sobolev、Allan H. White
DOI:10.1071/ch15761
日期:——
Single crystal X-ray studies of p-t-butylcalix[10]arene·2dmso·7H2O (1) and [NMe4][p-t-butylcalix[9]arene-H]·2dmso·H2O (2), provide new data on these large macrocycles and their conformations, that of 2 being the first where an encapsulated [NMe4]+ cation is present, while 1 contains the neutral ligand. Both were obtained as crystalline products of the reactions of the calixarenes with tetramethylammonium
An expedient one-pot synthesis of para-tert-butylcalix[8]- and [9]arene
作者:Sean P. Bew、Sunil V. Sharma
DOI:10.1039/b608482f
日期:——
We report the first efficient synthesis of para-tert-butylcalix[8]arene and -[9]arene via an exceptionally straightforward innovative protocol that takes place at ambient temperature, employing readily available tin(IV) chloride and s-trioxane.
The synthesis of a series of six new per-substituted p-tert-butylcalix[9]arenes derivatives has been achieved. Functions such as ester, nitrile, or carbonate have been grafted on the phenolic oxygens of calix[9]arene: p-tert-butylcalix[9]arene nona-ethyl acetate, p-tert-butylcalix[9]arene nona-carboxylic acid, p-tert-butylcalix[9]arene nona-cyanopropyloxy, p-tert-butylcalix[9]arene nona-tert-butoxycarbonyle
Calixarenes as aryloxides: oligonuclear europium(iii) derivatives
作者:Sean Fleming、C. David Gutsche、Jack M. Harrowfield、Mark I. Ogden、Brian W. Skelton、Donald F. Stewart、Allan H. White
DOI:10.1039/b305041f
日期:——
and structural studies of europiumcomplexes of calix[8]arene, p-t-Bu-calix[7]arene and p-t-Bu-calix[9]arene are reported. The complex [Eu2(calix[8]arene-6H)(dmso)5] was found to have a similar structure to previously reported p-t-Bu- and p-nitro-calix[8]arenecomplexes of the lanthanides. Despite being prepared under similar conditions, the complex of p-t-Bu-calix[7]arene was found to be a tetranuclear