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Bis(N-Heterocyclic Carbene) Manganese(I) Complexes in Catalytic N-Formylation/N-Methylation of Amines Using Carbon Dioxide and Phenylsilane

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Resumo:A series of six Mn(I) complexes with general formula [MnBr(bisNHC)(CO)3], having a bidentate bis(N-heterocyclic carbene) ligand (bisNHC), has been developed by varying the bridging group between the NHC donors, the nitrogen wingtip substituents and the heterocyclic ring. The synthesis of the complexes has been accomplished by in situ transmetalation of the bisNHC from the corresponding silver(I) complexes. Removal of the bromide anion affords the corresponding solvento complexes [Mn(bisNHC)(CO)3(CH3CN)](BF4). The influence of the bisNHC structure on its electron donor ability has been evaluated by FTIR and 13C NMR spectroscopy, both in the neutral and cationic complexes. Finally, the isolated Mn(I)-bisNHC complexes have been employed as homogeneous catalysts in the reductive N-formylation and N-methylation of amines with CO2 as C1 source and phenylsilane as reducing agent, showing a high selectivity for the N-methylated product. Preliminary mechanistic investigations suggest that, in the adopted reaction conditions, the formylated product can be formed via different reaction pathways, either metal-catalyzed or not, while the methylation reaction requires the use of the Mn(I) catalyst.
Autores principais:Masaro, Chiara
Outros Autores:Meloni, Giammarco; Baron, Marco; Graiff, Claudia; Tubaro, Cristina; Royo, Beatriz
Assunto:bidentate ligands carbon dioxide valorization manganese(I) complexes methylation of amines N-heterocyclic carbene Catalysis General Chemistry Organic Chemistry
Ano:2023
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade Nova de Lisboa
Idioma:inglês
Origem:Repositório Institucional da UNL

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