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quaternary ammonium compounds definition
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Derivatives of ammonium compounds, NH4+ Y-, in which all four of the hydrogens bonded to nitrogen have been replaced with hydrocarbyl groups. Compounds having a carbon-nitrogen double bond (i.e. R2C=N+R2 Y-) are more accurately called iminium compounds. See under onium compounds. E.g. [(CH3)4N]+ OH- tetramethylammonium hydrox

See also:
pure water definition
pyro definition
PWP definition
QWOT definition
pyrophoric gas definition
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