K. Tsubaki et al., The '2+1' construction of homooxacalix[3]arenes possessing different substituents on their upper rims, CHEM PHARM, 48(6), 2000, pp. 882-884
Several homooxacalix[3]arenes possessing different substituents on their up
per rims were synthesized in yields of 7-20% by a condensation reaction bet
ween the p-substituted phenol dimer and monomer under acidic high-dilution
conditions.