【摘要】 在~1H—NMR谱图中丁烯二酸的顺、反式异构体各形成分立的单峰,它们的化学位移相差0.42ppm。因此用动态核磁共振方法可以准确地测量异构反应整个过程的转化率。本文以动态核磁共振(DNMR)方法研究了顺式、反式丁烯二酸在253.7nm紫外光照射下的光异构反应,以及顺式丁烯二酸在138℃时的热异构现象。更多还原

【Abstract】 In 1H NMR spectra, cis-butenedioic acid differs from the trans-isomer in singlet peaks. The difference between their chemical shifts reaches to 0.42 ppm. With the help of dynamic NMR(DNMR), the photochemical isomerization of trans- and cis-butenedioic acid under irradiation of 253.7 nm ultra-violet rays and the thermal isomerization of maleic acid at 138℃ are described.更多还原