A catalyst refers to a substance that increases the rate of a reaction without changing the overall standard Gibbs free energy change of the reaction. Ligands represent atoms, molecules, and ions that can bond with a central atom (metal or metalloid). In general, ligands will donate at least one electron when participating in a bond. Two-phase catalysis of catalysts and ligands is the first application in the field of fluorine chemistry. The method of self-fluorine two-phase catalysis has developed rapidly, and a large number of new fluorine-based catalysts and ligands (especially phosphines) have been obtained in the field of chemistry.
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Indole is a compound of pyrrole and benzene in parallel, also known as benzopyrrole. There are two combinations of pyrrole and benzene, called indole and isoindole, respectively. Many derivatives of indole have physiological and pharmacological activities, and can synthesize vasodilators, antihistamines, antipyretic analgesics, etc. in medicine, so indole is also a very important heterocyclic compound.
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