-Hydroxylated Prism[]arenes: Supramolecularly Assisted Demethylation of Methoxy-Prism[5]arene.

Methoxy-prism[5]arene is demethylated by a supramolecularly assisted reaction. In the presence of a tetramethylammonium cation, is demethylated by BBr in high yield, while in its absence a 55/40 mixture of / is formed. The dealkylation of prismarenes, such as (R = Et, Pr) and , can be easily obtained in high yields in the presence of BBr.

Dispersing and Retarding Properties of Water-Soluble Tetrasulfonate Resorcin[4]arene and Pyrogallol[4]arene Macrocycles in Cement-Based Mortar.

Water-soluble tetrasulfonate resorcin[4]arene ( and ) and pyrogallol[4]arene () macrocycles were synthesized and investigated for their dispersing properties in cement-based mortars. Mortar tests clearly show that these polyhydroxylated macrocycles (nonpolymeric) work as cement dispersants. Setting time determinations indicate that the macrocycles and show a retarding effect that is reminiscent of the behavior of superplasticizers (SPs) functionalized with polyhydroxylated β-CDs.