217814-59-0Relevant academic research and scientific papers
Organocobaloximes: Synthesis, oxygen insertion and kinetics
Gupta,Kanth, V.Vijai,Singh, Veena
, p. 1 - 7 (2007/10/03)
A total of 27 organocobaloximes have been synthesised and characterized with three different dioxime ligands, dmgH, chgH and dpgH. Many of the chgH and all the dpgH complexes have been synthesised for the first time. The insertion of molecular oxygen into these organocobaloximes, RCoIII(L2)B [L=dmgH, chgH and dpgH) under thermal and photochemical conditions have been studied. Kinetic studies at ambient temperature under irradiation show that the rate of insertion depends upon the nature of R, L, B and the solvent. The rate follows the order dpgH>chgH>dmgH; Naphthyl>heteroaromaticmethyl>benzyl; piperidine>morpholine>γ-picoline>pyridine>2- bromopyridine>2-acetylpyridine; and the rates are faster in acetonitrile than in acetone and chloroform. In methanol, the benzylic cobaloximes exist as an equilibrium mixture of solvated penta-coordinated and hexa-coordinated species and in chloroform these exist as hexa-coordinated species.
