Keming Zhan, Jianming Yuan, Xiaoma Jiang. The DNMR study of tautomerization of cis-and trans-butenedioic acid[J]. Nuclear techniques, 1989, 12(6): 345-347.
Keming Zhan, Jianming Yuan, Xiaoma Jiang. The DNMR study of tautomerization of cis-and trans-butenedioic acid[J]. Nuclear techniques, 1989, 12(6): 345-347.DOI:
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.