This indicates that the catalyst is in a different phase (e.g., solid) than the reactants (e.g., liquid or gas). Heterogeneous catalysts are often used in industrial processes because they are easily separable from the reaction mixture.
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ETHYL 1-(3-PYRIDYLMETHYL)PIPERIDINE-4-CARBOXYLATE
trans-1,3-cyclohexanedicarboxylic acid
