Synthesis and characterization of non-symmetric Ni(II)- and Pd(II)-POCOP pincer complexes derived from 1,7-naphthalenediol. Evaluation of their catalytic activity in Suzuki-Miyaura couplings

• Published in: Inorganica Chimica Acta 2020-11, Vol.512, p.119920, Article 119920
• Main Authors: Favela-Mendoza, Roberto, Rufino-Felipe, Ernesto, Valdés, Hugo, Toscano, Ruben A., Hernandez-Ortega, Simon, Morales-Morales, David
• Format: Article
• Language: English
• Subjects: C-C couplings promoted by microwaves; Catalysis; Catalytic activity; Chemical reactions; Chemical synthesis; Coordination compounds; Coupling (molecular); Couplings; Cross coupling; Crystal structure; Crystals; Molecular structure; Nickel complexes; Non-symmetric POCOP pincer complexes; Palladium complexes; Single crystals; Suzuki-Miyaura couplings
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2020.119920

[Display omitted] •A series of Ni(II)- and Pd(II)-POCOP pincer complexes derived from 1,7-naphthalenediol were synthesized.•The M(II)-POCOP pincer complexes were efficient catalysts in Suzuki-Miyaura couplings.•The Pd(II)-POCOP were more active than their Ni(II) analogues under MW irradiation. A series of non-symmetric Ni(II)- and Pd(II)-POCOP pincer complexes derived from 1,7-naphthalenediol were synthesized and fully characterized. The molecular structures of four complexes were unambiguously determined by single-crystal X-ray diffraction analysis, revealing slightly distorted square-planar geometries around the metals. The series of complexes were evaluated in Suzuki-Miyaura C-C cross-coupling reactions under traditional thermal heating and promoted by microwave irradiation. As expected, the Pd(II)-pincer complexes exhibited better performances than the Ni(II) derivatives. Being complex 3-Pd the best catalyst of the series, reaching 73% conversion in only 20 min.