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When tetraketone, in which two dibenzoylmethanate groups are connected by a disulfide bridge through central (α) carbon atoms, was treated with a mixture of boron trifluoride ether and tributyl borate, a binuclear complex containing bordibenzoylmethanate fragments was obtained. Like aromatic disulfides, this compound is cleaved by the action of sulfuryl chloride and bromine to form sulfenyl chloride or sulfenyl bromide derivatives. These compounds enter into substitution and addition reactions common for sulfenyl halides, making it possible to obtain bordibenzoylmethanate complexes containing various functional groups linked to the chelate cycle through the central carbon atom. Based on 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. [ABSTRACT FROM AUTHOR]

By cleavage of disulfide and diselenide derivatives of the boron difluoride acetylacetonate the previously unknown sulfenyl(selenyl) chlorides and bromides were prepared. It was shown that these compounds could be involved into the substitution and addition reactions characteristic of sulfenyl(selenyl) halides. [ABSTRACT FROM AUTHOR]