Ruthenium Complexes Bearing α-Diimine Ligands and Their Catalytic Applications in N-Alkylation of Amines, α-Alkylation of Ketones, and β-Alkylation of Secondary Alcohols

Sekar Gayathri; Periasamy Viswanathamurthi; Roberta Bertani; Paolo Sgarbossa

doi:10.1021/acsomega.2c03200

Ruthenium Complexes Bearing α-Diimine Ligands and Their Catalytic Applications in N-Alkylation of Amines, α-Alkylation of Ketones, and β-Alkylation of Secondary Alcohols

ACS Omega. 2022 Sep 7;7(37):33107-33122. doi: 10.1021/acsomega.2c03200. eCollection 2022 Sep 20.

Authors

Sekar Gayathri¹, Periasamy Viswanathamurthi¹, Roberta Bertani², Paolo Sgarbossa²

Affiliations

¹ Department of Chemistry, Periyar University, Salem 636 011, Tamil Nadu, India.
² Department of Industrial Engineering, University of Padova, via F. Marzoloa, Padova 35131, Italy.

Abstract

New Ru(II) complexes encompassing α-diimine ligands were synthesized by reacting ruthenium precursors with α-diimine hydrazones. The new ligands and Ru(II) complexes were analyzed by analytical and various spectroscopic methods. The molecular structures of L₁ and complexes 1, 3, and 4 were determined by single-crystal XRD studies. The results reveal a distorted octahedral geometry around the Ru(II) ion for all complexes. Moreover, the new ruthenium complexes show efficient catalytic activity toward the C-N and C-C coupling reaction involving alcohols. Particularly, complex 3 demonstrates effective conversion in N-alkylation of aromatic amines, α-alkylation of ketones, and β-alkylation of alcohols.