Tetrabutylammonium Iodide
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
(C4H9)4NI 369.37 CAS RN®: 311-28-4.-White, shiny, crystalline flakes. Soluble in alcohol and in ether; slightly soluble in water.
Assay: Dissolve 370 mg, accurately weighed, in 60 mL of acetone with vigorous stirring. Stir the solution by mechanical means, add 10 mL of 16% sulfuric acid, and titrate with 0.1 N silver nitrate VS, determining the endpoint potentiometrically, using a glass-silver electrode system, and adding the titrant in 0.1-mL increments as the endpoint is approached. Perform a blank determination, and make any necessary corrections. Each mL of 0.1 N silver nitrate is equivalent to 36.94 mg of (C4H9)4NI: not less than 99.0% is found.
