Infrared spectra of phenylboronic acid (normal and deuterated) and diphenyl phenylboronate

The infrared spectra of phenylboronic acid, normal and deuterated, and diphenyl phenylboronate have been recorded in the range 4000–300 cm −1 and assignments of the observed frequencies have been made. The spectrum of the acid in the OH stretching region shows evidence of intramolecular hydrogen bonding. The spectrum of diphenyl phenylboronate has been interpreted by analogy with monosubstituted benzene derivatives. The two different environments of the phenyl groups in this molecule give rise to splitting of two of the characteristic vibrations of the benzene ring near 760 and 680 cm −1 .