Quaternary Ammonium Compounds

**Definition:** Derivatives of ammonium compounds, NH4+ Y-, in which all four of the hydrogens bonded to nitrogen have been replaced with hydrocarbyl groups. These are distinguished from IMINES which are RN=CR2.

**Tree numbers:** - D01.625.062.500 - D02.092.877 - D02.675.276

**Synonyms:** - Quaternary Ammonium Compound