α-Thiosubstituted boron difluoride dibenzoylmethanates

Treatment of tetraketone, in which two dibenzoylmethane groups are connected by a disulfide bridge through central (α) carbon atoms, gave a dinuclear complex containing boronodibenzoylmethanate fragments. Like an aromatic disulfide, this compound is cleaved by the action of sulfuryl chloride and bromine to form sulfenyl chloride or sulfenyl bromide derivatives. It was shown that these compounds enter into substitution and addition reactions common for sulfenyl halides, making it possible to obtain boronodibenzoylmethanate complexes containing various functional groups linked to the chelate cycle through the central carbon atom. Based on the results of studying the UV spectra of the obtained compounds, an assumption was made about the nature of the interaction of α and β substituents with the chelate ring.