(1) The Raman spectra of methyl and ethyl esters of α-furfuracrylic acid, cinnamic acid, α-furylpropionic acid, and hydrocinnamic acid have been measured. (2) On comparing the Raman spectra of α-furfuracrylates with those of trans-cinnamates and other cinnamic compounds, the so-called stable furfuracrylates are considered as the trans-esters.
(1) A cell was constructed from the silver positive and iron negative in KOH solution, and the charge and discharge curves of the positive were examined. (2) It was known that the discharge curve runs in two steps in general, which can be interpreted by assuming that there occurs the following consecutive chemical reactions. Ag_2O_2→Ag_2O→2Ag (3) The chemical analysis of the active material of charged silver positive supports the above consideration. (4) The coefficient of utility of the active material of the silver positive is much higher than that of the lead peroxide positive of the lead acid cell.