Kinetics of the liquid-phase oxidation of 1,4-dioxane in the presence of inhibitors

The kinetics of 1,4-dioxane oxidation initiated by azodiisobutyronitrile in the temperature range from 323 to 353 K are studied from the rate of oxygen absorption. The oxidation proceeds in the regime of a nonbranched chain reaction with quadratic-law chain termination. The apparent rate constants (fk ₇) of 1,4-dioxane oxidation inhibition by 2,6-ditert-butyl-4-methylphenol and quercitin are measured. Quercitin is not inferior to ionol in inhibition efficiency.     

Synthesis of 1,2,3,4-tetrasubstituted aluminacyclopent-2-enes using Cp<Subscript>2</Subscript>ZrCl<Subscript>2</Subscript> as catalyst

Efficient procedures have been developed for the synthesis of 1,2,3,4-tetrasubstituted aluminacyclopent-2-enes via intermolecular cycloalumination of terminal olefins and acetylenes with EtAlCl₂ or cycloalumination of acetylenes with higher trialkylalanes in the presence of Cp₂ZrCl₂ as catalyst.     

Synthesis and transformations of metallacycles. 29. Direct alumination of olefins, conjugated dienes, and acetylenes with alkylhaloalanes catalyzed by Zr and Ti complexes

Catalytic methods were developed for the synthesis of acyclic 1,2- and 1,4-dialuminum compounds by the reactions of olefins, dienes, or acetylenes with R₂AlCl (R = Et, Et₂N, (cyclo-C₆H₁₁)₂N, BuⁿO, or n-C₆H₁₃O) in the presence of Ti- or Zr-containing complex catalysts and magnesium metal as an acceptor of chloride ions.     

Synthesis and transformations of metallacycles. 31. Catalysts based on cobalt complexes in reactions of trialkyl- and alkylhaloalanes with olefins,allenes, and acetylenes

Cobalt-containing complexes capable of catalyzing reactions of trialkyl- and alkylhaloalanes (R _n AlCl_3–n ) with olefins, allenes, and acetylenes were synthesized. The reactions afford cyclic and acyclic organoaluminum compounds.     

Reaction of acyl isocyanates with β-keto esters

Conclusions Acyl isocyanates react with- keto esters to give both O- and C-addition products. The O-addition products subsequently rearrange to the thermodynamically more stable C-addition products.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1344–1349, June, 1980.     

The reaction of butadiene with morpholine as catalyzed by nickel complexes

Conclusions Selective catalysts containing nickel have been developed for the reaction of butadiene with morpholine which allow the preparation of N-butenyl- and N-octadienylmorpholine with high yields.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1795–1799, August, 1976.     

Antiradical activity of 5-amino-1,3,6-trimethyluracil in the radical chain oxidation of ethylbenzene as the model system

The antiradical activity of 5-amino-1,3,6-trimethyluracil was quantitatively measured in the initiated radical chain oxidation of ethylbenzene as the model system. The rate constant of the reaction of 5-amino-1,3,6-trimethyluracil with the ethylbenzene peroxyl radical at 333 K was found: k ₇ = (2.1 ± 0.3) × 10⁵ L mol^?1 s^?1. The kinetics of 5-amino-1,3,6-trimethyluracil consumption in the course of the radical chain oxidation of ethylbenzene was studied. The stoichiometric inhibition factor was determined to be f = 2.