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Polemic against conclusions drawn in “Palladium/iodide catalyzed oxidative carbonylation of aniline to diphenylurea: Effect of ppm amounts of iron salts” (J. Catal. 369 (2019) 257–266)

Author:
Gabriele, Bartolo, Mancuso, Raffaella, Veltri, Lucia, Della Ca', Nicola
Source:
Journal of catalysis 2019
ISSN:
0021-9517
Subject:
aniline, autoclaves, iron, ligands, palladium, salts, stainless steel
Abstract:
In the article mentioned in the title, the authors have tried to demonstrate that, in the previously reported Pd/iodide-catalyzed oxidative carbonylations of amines to give ureas, the role of iodide ligands was essentially to “etch” the stainless steel autoclaves where the process was performed, releasing in solution small amounts of iron salts. These latter iron species were, in their opinion, the real co-catalysts of the reaction, through the presumed formation of more active Pd/Fe bimetallic species. However, no solid experimental evidence corroborating this hypothesis has been given in the article, while all previous experimental evidences and literature data tend to exclude the involvement of iron co-catalysis in the Pd/iodide-promoted reactions.
Agid:
6350323