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The N,N-bis(salicylidene)ethylenediaminocobalt(III)-catalyzed oxidative carbonylation of ortho-, meta- and para-substituted aromatic primary amines in methanol gives ureas, isocyanates, carbamates, azoderivatives. The conversion is correlated for six substrates with Hammett σ giving a p = -0.5. This suggests the electrophilic attack of carbon monoxide at a nitrogen anion complexed to cobalt in the...
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