A quaternary ammonium salt with a bromide that is frequently used as a phase transfer catalyst is tetra butyl ammonium bromide (TBAB). Several more tetra butyl ammonium salts are made with it using salt metathesis processes. The white solid is the anhydrous form. Tetra butyl ammonium bromide is inexpensive, but it’s also more selective, non-corrosive, easy to recycle, and has a simple operational design.

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