Spectroscopy and structure of (1,3-diketonato)boron difluorides and related compounds

Abstract

I.r., u.v., and n.m.r. (¹H, ¹⁹F and in some cases ¹¹B) spectra of a number of boron difluoride complexes have been recorded. These are discussed in detail and related to the electron distribution in the various systems dealt with. Included are those boron difluorides obtained from a series of 1,3-diketones, methyl salicylate, and tropolone. Two novel boron difluorides derived from 3-anilino-1-phenyl and 3-benzylamino-1-phenylbut-2-enone have been prepared and compared with the others. All are held to be true chelates in which the boron atom is in a pseudosymmetric environment.