Boron difluoride beta-diketonates: II. Synthesis of boron difluoride naphthoyl- and anisoylbenzoylmethanates substituted in the benzene ring

Destructive acylation of copper(II) naphthoyl- and anisoylacetonates with s ubstituted benzoyl chlorides yielded beta-diketones containing two aromatic substituents. Their reaction with boron trifluoride etherate in the presen ce of tributyl berate gave the corresponding boron difluoride beta-diketona tes. The majority of the boron difluoride chelates prepared show a bathoflo ric shift of the fluorescence maximum as compared to the fluorescence spect ra of boron difluoride naphthoyl- and anisoylacetonates.