Simple Process for the Preparation of Cetyltrimethylammonium Naproxenate (Naprocet)
摘要:
Specifications for cetyltrimethylammonium (CTA) naproxenate (naprocet), the active ingredient of pharmaceutical liquid preparations used as antiseptic-antinflammatory detergents, fix severe limits to the presence of residual inorganic counteranion deriving from the starting CTA salt. A new simple procedure, which avoids ionic exchange chromatography and utilizes CTAHSO(4) in place of CTABr and CTACl, exploits the quantitative precipitation of K2SO4 from methanol to yield naprocet in line with such specification requirements.
Synthesis and properties of long-chain quaternary ammonium hydroxides
作者:Tao Geng、Xiao-Guang Teng、Qiu-Xiao Li、Ya-Jie Jiang、Guo-Jin Li
DOI:10.1016/j.cclet.2013.03.051
日期:2013.6
long-chain quaternaryammoniumhydroxides were synthesized from tertiary amines and confirmed by 1 H NMR and FTIR. Surface properties and pH of these surfactants were investigated. The critical micelle concentrations (CMC) of the synthesized quaternaryammoniumhydroxides are lower than the conventional quaternaryammonium surfactants. The micelles shapes of these long-chain quaternaryammonium hydroxides
摘要由叔胺合成了一系列长链季铵氢氧化物,并通过1 H NMR和FTIR进行了证实。研究了这些表面活性剂的表面性质和pH。合成的季铵氢氧化物的临界胶束浓度(CMC)低于常规的季铵表面活性剂。这些长链季铵氢氧化物在水溶液中的胶束形状为球形,浓度为0.1 mol / L。合成的季铵氢氧化物的pH值为12.25–12.51。