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The phase transitions of 2-methoxycinnamic acid, 3-methoxycinnamic acid,4-methoxycinnamic acid and 4-hydroxy-3-methoxycinnamic acid were studied by DSC.The thermodynamic parameters of phase transitions for these compounds are reported in this paper. In addition, the 1H-NMR spectra of compounds 2-methoxycinnamic acid, 3methoxycinnamic acid and 4-methoxycinnamic acid have been measured, and the change of β-H chemical shifts is consitent with that of DSC data fOr these compounds.
The phase transitions of 2-methoxycinnamic acid, 3-methoxycinnamic acid, 4-methoxycinnamic acid and 4-hydroxy-3-methoxycinnamic acid were studied by DSC. These thermodynamic parameters of phase transitions for these compounds are reported in this paper. the 1H-NMR spectra of compounds 2-methoxycinnamic acid, 3methoxycinnamic acid and 4-methoxycinnamic acid have been measured, and the change of β-H chemical shifts is consitent with that of DSC data fOr these compounds.