H. Konishi et al., FUNCTIONALIZATION AT THE EXTRAANNULAR POSITIONS OF CALIX[4]RESORCINARENE USING A MANNICH-TYPE THIOMETHYLATION, Tetrahedron letters, 37(47), 1996, pp. 8547-8548
Treatment of calix[4]resorcinarene 1 with thiols and formaldehyde in t
he presence of triethylamine gave thiomethylated calix[4]resorcinarene
s 2 in moderate yields. The thiomethylation also took place in acetic
acid. Copyright (C) 1996 Elsevier Science Ltd