P. Timmerman et al., ISOLATION AND X-RAY CRYSTAL-STRUCTURE OF A STABLE CALIX[4]ARENE MONOHEMIKETAL, Journal of inclusion phenomena and molecular recognition in chemistry, 16(2), 1993, pp. 189-197
The formation of a stable calix[4]arene monohemiketal is described. X-
ray crystallographic data provide conclusive evidence for the presence
of a stabilizing hydrogen bond.