A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, name: Benzyltriethylammonium bromide, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 5197-95-5, Name is Benzyltriethylammonium bromide, molecular formula is C13H22BrN. In a Patent, authors is ，once mentioned of 5197-95-5
A 3-halogenated cephem derivative is prepared by causing a halogenating reagent to act on an allenyl beta -lactam compound in the presence of a sulfinate ion or thiolate ion capturing agent to obtain the 3-halogenated cephem derivative.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI