Search

This paper reported a headspace gas chromatographic (HS-GC) method for the determination of ethoxyl in ethyl cellulose. A 0.5 mL sample of hydroiodic acid (57%) was added to ∼20 mg samples in a closed headspace test vial (20mL) for 30 min at 120°C, for the quantitative cleavage of ethoxyl with hydroiodic acid (HI) to form ethyl iodide. After the reaction, the excess amount of HI in the vial was neutralized by injecting a sodium hydroxide solution, and then the ethyl iodide in the vial was determined by headspace gas chromatography using a flame ionization detector. The results showed that the method has an excellent measurement precision (RSD <0.5%) and accuracy (recovery = 98.6 ± 0.5%) for the quantification of ethoxyl content in ethyl celluloses. The present method is simple and accurate, which can be used for the efficient determination of ethoxyl substitution in ethyl cellulose related research. [ABSTRACT FROM PUBLISHER]

3,5-Dicyano-2,6-diethylthiopyridine has been synthesized by the alkylation of cyanothioacetamide with ethyl iodide in DMF and its molecular and crystal structures have been investigated. [ABSTRACT FROM AUTHOR]