Abstract
AbstractAn efficient direct method for di‐, tri‐ and tetraformylation of thiacalix[4]arenes substituted on the para positions is described. Di‐ and triformylated thiacalix[4]arenes were obtained by formylation of partially propyl‐ or benzoyl‐substituted thiacalix[4]arenes. Complete para‐formylation was successfully achieved by formylation and dealkylation of tetraisopropoxythiacalix[4]arene conformers in one step. This experimental procedure is a simpler synthesis for completely formylated thiacalix[4]arene than the indirect method reported previously from brominated thiacalix[4]arene.
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