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Royal Society of Chemistry, New Journal of Chemistry, 3(39), p. 2042-2051

DOI: 10.1039/c4nj01300j

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Pd(II) complexes with amide-based macrocycles: Syntheses, properties and applications in cross-coupling reactions

Journal article published in 2015 by Sushil Kumar ORCID, Rajeev Ranjan Jha, Rajeev Gupta, Sunil Yadav
This paper is available in a repository.
This paper is available in a repository.

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Abstract

This work shows Pd(II) complexes in a set of 13-membered amide-based macrocyclic ligands varied by the placement of e-–donating and e-–withdrawing substituents on the ligand framework. Ligands constitute a N4 square–planar cavity and optimally house the Pd(II) ion. The solution-state structure via NMR and absorption spectra substantiates the solid-state structure obtained by the crystallography. The electrochemical studies display the impact of electronic substituents on ligands that significantly influence the redox properties and also shift the locus of oxidation. These complexes were used in the Suzuki and Heck cross – coupling reactions. The moderate cross–coupling reaction results are due to limited redox accessibility that can be improved either by using substrates with better leaving group or by placing electron–withdrawing substituents on the macrocyclic ligands.