Tetrapropylammonium (TPA) is a quaternary ammonium cation with the formula [N(C3H7)4]+, also denoted [NPr4]+ (where Pr = propyl group). It is a precursor to several significant industrial and laboratory catalysts.
The compounds of every Wikipedia article carrying a Chembox or a Drugbox, refreshed daily, with the values their infoboxes give. The pages need JavaScript; the API does not.