Synthesis of Diethyl 2,3-dicyano-2,3-Bi(p-substituted phenyl)-succinates and Its Decompositions in Styrene

Abstract

Abstract: Diethyl 2,3-dicyano- 2,3-bi(p-Xphenyl)specinates(X=OCH₃, CH₃,Cl, NO₂) were synthesized and meso and dl-isomers were separated for the each diester by fractional recrystal-lization, of which the structures were determined by means of elemental analysis, ¹H NMR,IR, MS and X-ray crystallogram analysis. The rate constants of the thermal decomposition of these compounds in styrene at 100℃ were observed by use of dilatometry. The results indicated that kt of meso-isomers with the exception of compound 1 are larger than kd of dl-isomers, and the influence of the p-substituents in benzene ring on kd is in the following order: OCH₃>CH₃>Cl>H.

Key words: Diethyl 2,3-dicyano-2,3-bi (p-substitutedphenyl) succinates, Synthesis, Thermal decomposition rate constant

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Yang Di-lun, Qi Chen-ze, Li Zhao-long, Liu You-cheng . Synthesis of Diethyl 2,3-dicyano-2,3-Bi(p-substituted phenyl)-succinates and Its Decompositions in Styrene[J]. Chem. J. Chinese Universities, 1991, 12(12): 1623.

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Synthesis of Diethyl 2,3-dicyano-2,3-Bi(p-substituted phenyl)-succinates and Its Decompositions in Styrene

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