A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Computed Properties of C12H28BrN, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1941-30-6, Name is Tetrapropylammonium bromide, molecular formula is C12H28BrN. In a Article, authors is Carcedo, Cristina，once mentioned of 1941-30-6
The synthesis and silver(I) and gold(I) coordination chemistry of a new chiral, bidentate N-heterocyclic carbene (NHC) dehydrohexitol derivative (3) are reported. The imidazolium salt [H23][PF6]2 reacts with Ag2O and Au(tht)Cl (tht = tetrahydrothiophene) precursors to form the isostructural 18-membered metallamacrocyclic dimers [Ag 2(mu-3)2][PF6]2 and [Au 2(mu-3)2][PF6]2 and the monocarbene complex [(AuCl)2(mu-3)]. Single-crystal X-ray structures have been determined for the bis-imidazolium precursor [H 23][PF6]2 and corresponding Ag(I) and Au(I) complexes of ligand 3. Comparison between the X-ray-derived structures and solution-phase NMR data for [Ag2(mu-3)2][PF 6]2 and [Au2(mu-3)2][PF 6]2 demonstrate that the complexes adopt a conformation in solution different from that found in the solid state, implying a conformational flexibility of the metallamacrocycle in solution. Both [(AuCl)2(mu-3)] and [Au2(mu-3)2][PF 6]2 are emissive in the solid state at ca. 380 nm (lambdaex = 295 nm). Time-resolved luminescence measurements indicate different excited-state lifetimes for the two species, with [(AuCl)2(mu-3)] measured at 35 ns and [Au2(mu-3) 2][PF6]2 at 379 ns. The chiroptical properties of the silver and gold NHC complexes have been studied by circular dichroism (CD).
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI