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Tetra-n-butylammonium bromide (TBAB) is a quaternary ammonium salt with a bromide counterion commonly used as a phase transfer catalyst.
T 1287 (OTTO) Tetrabutylammonium bromide, GR 99%+ Cas 1643-19-2 - used to prepared many other tetrabutylammonium salts via salt metathesis reactions.