Bromination acetylacetone chromium complexes

The bromination of tris(acetylacetonato)chromium(III) was first reported by Reihlen.781 There have been many studies of electrophilic substitution at complexes of both acetylaceton-ate and its derivatives this work has been extensively reviewed.782,783 Some typical reactions are outlined below (equation 42). In this section, we shall briefly mention some more recent work the interested reader is recommended to study the extensive, although somewhat dated, review by Collman,782 and Mehrotra s book.783... 

The electrophilic substitutions of acetylacetonate complexes have been taken as suggesting aromatic character in the chelate ring. Results with seventeen different 1,3-diketonatochromium(III) complexes were recently held to support this suggestion (176-178 equation 43).784 The bromination of tris(l,l,l-trifluoro-2,4-pentanedionato)chromium(III), previously claimed to be unreactive,785 has been reported.786... 

In the above examples, the nucleophilic role of the metal complex only comes after the formation of a suitable complex as a consequence of the electron-withdrawing effect of the metal. Perhaps the most impressive series of examples of nucleophilic behaviour of complexes is demonstrated by the p-diketone metal complexes. Such complexes undergo many reactions typical of the electrophilic substitution reactions of aromatic compounds. As a result of the lability of these complexes towards acids, care is required when selecting reaction conditions. Despite this restriction, a wide variety of reactions has been shown to occur with numerous p-diketone complexes, especially of chromium(III), cobalt(III) and rhodium(III), but also in certain cases with complexes of beryllium(II), copper(II), iron(III), aluminum(III) and europium(III). Most work has been carried out by Collman and his coworkers and the results have been reviewed.4-29 A brief summary of results is relevant here and the essential reaction is shown in equation (13). It has been clearly demonstrated that reaction does not involve any dissociation, by bromination of the chromium(III) complex in the presence of radioactive acetylacetone. Furthermore, reactions of optically active... 

Tris(3-bromoacetylacetonato)chromium(III) is a dark red-brown crystalline material, which dissolves in benzene to form a green solution. The infrared spectrum of this chelate exhibits a characteristic strong singlet at 1540 cm. i, whereas chromium(III) acetylacetonate exhibits two peaks in this region, at 1560 and 1520 cm. b The ultraviolet spectrum of the brominated chromium chelate in chloroform exhibits a Xmax at 358 m/i(e = 13,070). The brominated chelate is reported to form a stable clathrate complex with chloroform (m.p. 240 to 241°). ... 

The first report of a coordinated acetylacetone reaction was the bromination of the chromium(III) complex (equation 55). This was followed, more than 30 years later, by the nitration of copper(II) acetylacetonate with dinitrogen tetroxide (equation This result is... 

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