The quasi-aromatic property of metal chelates of thio-#x3B2;-diketones has been studied by reacting them with phenylisocyanate, where addition takes place at the #x3B3;-CH in a stepwise manner. Mono-thiodiketonates of Ni(II), Pd(II), cu(II) and Co(III) and the dithio-acetylacetonate of Ni(II) react with phenylisocyanate to produce mono-, di- and triphenylamido with cobalt (III) only substituted derivatives. In the case of tris (ethylthioacetoacetato) cobalt (III), it is found that the reaction with phenylisocyanate gives two isomers, a chocolate coloured isomer in which the phenylamido carbonyl is not coordinated while the green coloured isomer has bonding through phenylemido carbonyl oxygen. The reactions of the thiodiketonates have been compared with those of #x3B2;-diketonates and #x3B2;-ketoiminates. The reaction products have been characterised by elemental analyses, magnetic moments, and electronic, IR and1H NMR spectral studies.
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