[Quantitative determination of the phenolic ester of phenylmalonic acid by an IR spectroscopy method]. / Kolichestvennoe opredelenie fenilovogo éfira fenilmalonovoi kisloty metodom IK-spektroskopii.

ABSTRACT

A quantitative method was developed for determination of phenyl ether of phenylmalonic acid (I) in the presence of phenol. The method is based on measurement of the optic density of the characteristic absorption bands of I at 1133 and 1770 cm-1 of IR-spectrum. Absorption of I at the above frequencies responded to Ber's law. Determination of I (solution in methylen chloride) was carried out on a standard curve in accordance with equation y bx for the both frequencies. The value of constants b of the direct regressions for the frequencies of 1133 and 1770 cm-1 were determined with relative errtor of +/- 1.2 and 2.3 per cent respectively. The correlation coefficients were equal to 0.98 and 0.95.