In heterogeneous catalysis, the catalyst is in a different phase from the reactants. SDS of cas: 1532-97-4, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 1532-97-4, name is 4-Bromoisoquinoline. In an article，Which mentioned a new discovery about 1532-97-4
A multicomponent reaction involving the interaction of azines (quinolines, isoquinolines, and phenanthridine) with activating agents (chloroformates, acid halides, and sulfonyl halides), isocyanides, and water is described. The products of this process, alpha-carbamoylated-1,2-dihydroazines, are the result of the addition of the isocyanide partner to the N-acylazinium salt formed in situ. This represents a new source of iminium ion equivalents for Ugi-type reactions.
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Reference：
Isoquinoline – Wikipedia,
Isoquinoline | C9H3088N – PubChem