RT info:eu-repo/semantics/article
T1 Palladium hydrazonato complexes and their role in the Pd-catalyzed cross-coupling reactions of hydrazones as carbene precursors
A1 Villalba de Pando, Francisco
A1 Albéniz Jiménez, Ana Carmen
K1 Chemistry
AB Hydrazones are common carbene precursors in many palladium-catalyzed cross coupling reactions of carbenes as a coupling partner, but their interaction with palladium has been overlooked. We have found that hydrazonato ligands readily coordinate to Pd aryl complexes leading to [Pd(Ar)(L-L){(TolSO2)N-N=CHR}] (Ar = Ph, C6F5; L-L = dppe, dppf; R = CH=CHPh, Ph). Ligand substitution reactions on [Pd(Ar)(dppe)X] (X = Br, TolSO2) show that the hydrazonato ligand coordinates preferently so the hydrazonato complexes are likely resting states in catalytic carbene coupling reactions using hydrazones as reactants. The decomposition of the hydrazonato moiety to a diazoalkane is needed during the catalysis and the analysis of the evolution of the hydrazonato complexes shows that it is not promoted by coordination to the metal and it does not occur in the coordination sphere of palladium. The substitution of diazoalkane for the metal-bound hydrazonato is possible and the steps that follow to form a new C-C bond, including the carbene migratory insertion, are fast.
PB Royal Society of Chemistry
SN 1477-9226
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/60225
UL https://uvadoc.uva.es/handle/10324/60225
LA eng
NO Dalton Transactions, 2022, 51, 17733–17742
NO Producción Científica
DS UVaDOC
RD 22-nov-2024