A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Computed Properties of C22H24BrP, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1779-51-7, Name is Butyltriphenylphosphonium bromide, molecular formula is C22H24BrP. In an article, author is Singh, V.,once mentioned of 1779-51-7.
Interesting results of catalytic hydrogenation of 3-(2-nitrophenyl)isoxazoles and 3-(nitrophenyl)-4,5-dihydroisoxazoles
The palladium-on-carbon assisted hydrogenolysis of substituted 3-(2-nitrophenyl)isoxazoles, irrespective of substitution on the isoxazole ring, invariably leads to reduction of the nitro to the amino group with concomitant regiospecific ring closure to yield substituted 4-aminoquinolines. In contrast similar hydrogenation of 3-(2-, 3-, and 4-nitrophenyl)-4,5-dihydroisoxazoles (2-isoxazolines) results in reduction of the nitro group only with conservation of the dihydroisoxazole ring to yield the corresponding 3-(aminophenyl)-4,5-dihydroisoxazoles.
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Reference:
Isoxazole – Wikipedia,
,Isoxazole | C3H3NO – PubChem