摘要
合成了2,3-二氰基-2,3-二(p-X苯基)丁二酸二乙酯(X=OCH_3,CH_3,Cl,NO_2),分离出它们的meso和dl异构体。经元素分析、~1H NMR、IR、MS和X射线晶体结构分析确定了各异构体的结构和构型。在100℃测定了各异构体在苯乙烯中的分解速率常数k_d,结果表明,除X=OCH_3外,meso异构体的k_d均比dl异构体的大,除X=NO_2外,苯环对位取代基对k_d的影响顺序为OCH_3>CH_3>Cl>H,
Diethyl 2,3-dicyano- 2 ,3-bi(p-X phenyl)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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第12期1623-1626,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
丁二酸二乙酯
苯乙烯
合成
分解
Diethyl 2, 3-dicyano-2, 3-bi (p-substitutedphenyl) succinates, Synthesis, Thermal decomposition rate constant
