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Reuse of a recovered, spent hydroprocessing catalyst in Indole acylations using cyclic anhydrides
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1  Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Carretera Toluca-Atlacomulco Km. 14.5, Toluca, Estado de México 50200, Mexico
2  Facultad de Química, Facultad de Química, Universidad Autónoma del Estado de México. Paseo Colón esq. Paseo Tollocan, 50120, Toluca, Mexico
Academic Editor: Julio A. Seijas (registering DOI)

Spent, wasted hydroprocessing catalysts from a petrochemical refinery were recovered from a consecutive draining-solvent extraction–calcination strategy. The activity of these recovered heterogeneous catalysts was evaluated in the acid-mediated indole acylation process. Thus, Bis-(indol-3-yl)-alkane diones were obtained when indole was reacted with cyclic anhydrides in presence of DMF as solvent and catalytic amounts of a spent hydroprocessing catalyst waste. In contrast, reaction between indole and phthalic anhydride afforded phthalimide in as major ptoduct

Keywords: Indole; acylation; reuse; Spent catalyst