Influence of the nature and structure of the N-heterocyclic activator in a complex catalyst on the kinetics of isopropylbenzene oxidation

Journal Article · Wed Dec 10 04:00:00 EST 1986 · J. Appl. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6424566

Kozlov, S K; Tovstokhat'ko, F I; Potekhin, V M

In order to investigate the mechanism of activation of zinc and cadmium ions by heteroaromatic additives, the authors studied the kinetic relationships of catalytic oxidation of isopropylbenzene in presence of various zinc and cadmium compounds, and also of a number of N-activators differing in structure, degrees of dentation, size of the aromatic system, and the type of substituent in the benzene ring. The monodentate activators used were pyridine (Py), quinoline, quinaldine (2-methyl-quinoline), acridine, and 1,5-phenanthroline (1,5-phen); the bidentate compounds were o-phen, 5-nitro-1,10-phenanthroline (5-NO2-o-phen), 2,2'-dipyridyl, and the methyl derivative of dibenzimidazolylmethane-2. The activating effect of N-heterocyclic bases is due to their ability to form complexes with metal ions, which depends on the structures, degree of dentation, and nature of the substituent in the aromatic ring of the promoter and also on the structure of the metal compound being activated. Activators capable of forming stable chelate bonds during super-coordination activate zinc and cadmium compounds, irrespective of their structure. Catalysts containing a bidentate n-heteroaromatic promoter and a zinc or cadmium chelate compound have higher selectivity in oxidation of isopropylbenzene to cumenyl hydroperoxide than mixed catalysts containing zinc or cadmium compounds of linear structure.

• OSTI ID: 6424566
• Journal Information: J. Appl. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Appl. Chem. USSR (Engl. Transl.); (United States) Vol. 59:6; ISSN JAPUA
• Country of Publication: United States
• Language: Russian

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACRIDINES
ACTIVATION ENERGY
AROMATICS
AZAARENES
AZINES
CADMIUM COMPLEXES
CADMIUM COMPOUNDS
CATALYSIS
CATALYTIC EFFECTS
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
COMPLEXES
CUMENE
ENERGY
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
KINETICS
MATERIALS TESTING
NITRO COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PEROXIDES
PHENANTHROLINES
PROMOTERS
PYRIDINE
PYRIDINES
QUINALDINE
QUINOLINES
REACTION KINETICS
TESTING
YIELDS
ZINC COMPLEXES
ZINC COMPOUNDS