H. Kumagai et al., FACILE SYNTHESIS OF P-TERT-BUTYLTHIACALIX[4]ARENE BY THE REACTION OF P-TERT-BUTYLPHENOL WITH ELEMENTAL SULFUR IN THE PRESENCE OF A BASE, Tetrahedron letters, 38(22), 1997, pp. 3971-3972
p-tert-Butylthiacalix[4]arene, in which the four methylene bridges of
p-tert-butylcalix[4]arene are replaced by sulfide linkages, is conveni
ently synthesized in a single step (54%) by heating a mixture of p-ter
t-butylphenol, elemental sulfur S-8, and NaOH in tetraethylene glycol
dimethyl ether with concomitant removal of the resulting hydrogen sulf
ide. (C) 1997 Elsevier Science Ltd.