Borylation of calix[4]resorcinols under ultrasonic irradiation

Abstract

The use of ultrasonic irradiation in the reactions of trialkyl borates with octahydroxytetraoctyl[l 4] metacyclophane allowed us obtaining tetraalkoxyboratocavitands with higher yields and under milder conditions. We first obtained 1,3,2-dioxaborolane and 1,3,2-dioxaborinane derivatives of tetraoctyl[l 4]meta-cyclophane using ultrasonic irradiation. Boratocavitands were converted into the corresponding amine complexes with isobutylamine. © 2012 Pleiades Publishing, Ltd.