SELECTIVE CYANATION BROMINATION OF COORDINATED BETA-DIKETONES USING CNBR AS A NEW REAGENT/

Cyanogen bromide was used as a new twin purpose reagent for brominatio n or cyanation of beta-diketonates of many transition and some non-tra nsition metals. Whereas inert and less labile chelates of Cr-III, Co-I II, Al-III and Be-II yielded gamma-brominated reaction products, the l abile ones of Co-II, Ni-II, Mg-II and Cu-II gave gamma-cyanated diketo nates. VOIV and Fe-III chelates yielded gamma-bromo products in methan ol and gamma-cyano products in chloroform. The reagent is the first cy anating agent for beta-diketonates. CNI was also used as a new reagent for beta-diketonates and the reactions were compared with those of CN Br.