FORMATION OF HETERO-BOROXINES:DYNAMIC COMBINATORIAL LIBRARIES GENERATED THROUGH TRIMERIZATION OF PAIRS OF ARYLBORONIC ACIDS

摘要

Condensation of pairs of arylboronic acids provided homo- and hetero-boroxines in solution as evidenced from NMR spectra,and those boroxines were detected in the gas phase by GC-MS spectrometry.Equilibrium constants for the formation of these boroxines in solution were obtained through integration of pertinent signals in the NMR spectra of the mixtures of boronic acids.