Structure and stability of isoxazoline compounds View Full Text


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Article Info

DATE

2013-04

AUTHORS

T. K. Goncharov, V. V. Dubikhin, E. L. Ignat’eva, G. M. Nazin, Z. G. Aliev, S. M. Aldoshin

ABSTRACT

Structure of isoxazoline compounds formed via the reaction of alkyl-substituted benzonitrile oxides with ethylene was determined by X-ray diffraction method. Isoxazoline ring is flattened, the bond lengths in it depend slightly on the nature of substituents (CH3, C2H5) and their position in the benzene ring and the angle of rotation relative to the isoxazoline ring. The connection N-O has a length 1.422 Å. Thermal decomposition of isoxazolines in a liquid phase (160–280°C) is accompanied by the release of acetaldehyde and aromatic nitrile. Both the structure of the cycle and its stability is practically independent of the structure of an aromatic substituent. The rate constant of the initial stage is characterized by the low significance of kinetic parameters, E = 104°8 kJ mol−1 and log a(A/c) = 7.2±0.8. The results obtained are rationalized in terms of biradical mechanism of isoxazoline ring-opening that includes an efficient recombination of the biradical and its disappearance as a result of synchronous multi-center rearrangement with the release of acetaldehyde. More... »

PAGES

717-721

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s107036321304018x

DOI

http://dx.doi.org/10.1134/s107036321304018x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1034766401


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