Simple
Process for the Preparation of Cetyltrimethylammonium
Naproxenate (Naprocet)
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Abstract
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<sub>4</sub> in place of CTABr and
CTACl, exploits the quantitative precipitation of K<sub>2</sub>SO<sub>4</sub> from methanol to yield naprocet in line with such specification
requirements