Jl. Atwood et al., Convergent synthesis of p-benzylcalix[7]arene: Condensation and UHIG of p-benzylcalix[6 or 8]arenes, ORG LETT, 1(10), 1999, pp. 1523-1526
[GRAPHICS]
p-Benzylcalix[5]arene and p-benzylcalix[7]arene are formed on ultrahigh int
ensity grinding (UHIG) of p-benzylcalix[6 or 8]arenes in the presence of KO
H and molecular sieves (4 Angstrom), and the same calix[7]arene is also for
med on condensation of p-benzylphenol and formaldehyde (15-20% yield), unde
r more forcing conditions, along with p-benzylcalix[10]arene.