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Communication | Special issue | Vol 74, No. 1, 2007, pp.219-223
Published online, 6th November, 2007
DOI: 10.3987/COM-07-S(W)61
Formation of Hetero-Boroxines: Dynamic Combinatorial Libraries Generated through Trimerization of Pairs of Arylboronic Acids

Yuji Tokunaga,* Hiroki Ueno, and Youji Shimomura

*Department of Materials Science and Engineering, Faculty of Engineering, Fukui University, Bunkyo, Fukui 910-8507, Japan


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.