"' Tetramethylammonium chloride "'is one of the simplest quaternary ammonium salts, with four methyl groups tetrahedrally attached to the central N . The chemical formula ( CH 3 ) 4 N + Cl " is often abbreviated further as Me 4 N + Cl ".
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In a related chemical test called "'Herzig Meyer alkimide group determination "'a tertiary amine with at least one methyl group and lacking a beta-proton is allowed to react with hydrogen iodide to the quaternary ammonium salt which when heated degrades to iodomethane and the secondary amine.
