Tetraalkylated 2,8,14,20-tetrathiacalix[4]arenes: Novel infinite channels in the solid state
Abstract
The synthesis of new tetraalkylated derivatives of 2,8,14,20- tetrahiacalix[4]arenes was achieved by the refluxing of thiacalixarenes in acetone or acetonitrile with the alkylation agent (R-I, R-Br) in the presence of K2CO3 or Cs2CO3. The structure of the tetraalkylated thiacalix[4]arenes was studied by means of H NMR experiments proving the 1,3- alternate conformation under measurement conditions (CDCl3, room temperature). The same conformation was established by X-ray analysis in the solid state where these derivatives create nice infinite channels.
This paper has been withdrawn.