Barium-promoted cobalt catalysts supported on carbon exhibit higher ammonia activities at synthesis temperatures than the commercial, multipromoted iron catalyst and also a lower ammonia inhibition.

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Little is known about the reactivity of d8 organometallic complexes with either organic or inorganic peroxo species as electrophiles. It is remarkable that, despite the current interest in the chemistry of late-transition-metal alkoxides and phenoxides,2 a preparative method based on oxygen insertion into the metal-carbon bond of organometallic compounds has so far remained unexplored. The search for selective methods for the oxy-functionalization of hydrocarbons3 provides a stimulus for the study of this subject. The C-H activating property of many late transition metals? combined with the kinetic lability of the late-transition-metxygen bond2ps formed by subsequent oxygenation of the metal-carbon bond, may form the basis for a catalytic process to reach the desired selectivity.A highly selective stoichiometric method for the ortho hydroxylation of azobenzene derivatives is based on a reaction sequence of cyclopalladation and subsequent oxygen insertion into the Pd-C bond with m-CPBA.lCfj Recently, several catalytic processes for the direct hydroxylation of simple aromatic compounds, such as benzene or anisole, with either hydrogen peroxide and a