title: Copper(II) mediated phenol ring nitration by nitrogen dioxide.
abstract: Cu(II) complexes of N2O2 type ligands, L(1)H2 and L(2)H2 [L(1)H2 = 6,6'-(((pyridin-2-ylmethyl)azanediyl)bis(methylene))bis(2,4-di-tert-butylphenol); L(2)H2 = 2,4-di-tert-butyl-6-(((3-(tert-butyl)-2-hydroxy-5-methylbenzyl)(pyridin-2-yl-methyl)amino)methyl)phenol], have been synthesized. Addition of nitrogen dioxide (NO2) in THF solutions of the complexes resulted in the nitration at the 4-position of a coordinated equatorial phenolate ring of the ligand frameworks. This nitration did not occur at the phenol ring which is axially coordinated to the metal center. Spectroscopic evidence suggests that the reaction proceeds through a phenoxyl radical complex formation.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India. biplab@iitg.ernet.in.
authors.forename: Vikash
authors.initials: V
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India. biplab@iitg.ernet.in.
authors.forename: Somnath
authors.initials: S
authors.lastname: Ghosh
authors.affiliation: Department of Chemistry, Indian Institute of Technology Indore, Indore 452017, India.
authors.forename: Anoop Kumar
authors.initials: AK
authors.lastname: Saini
authors.affiliation: Department of Chemistry, Indian Institute of Technology Indore, Indore 452017, India.
authors.forename: Shaikh M
authors.initials: SM
authors.lastname: Mobin
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India. biplab@iitg.ernet.in.
authors.forename: Biplab
authors.initials: B
authors.lastname: Mondal