Sulfuric Acid → 1-Chloroisoquinoline-5-sulfonic acid

Participants

Reaction Steps

1-chloroisoquinoline is dropwise added to 2 to 20, preferably 3 to 10, equivalent of forming sulfuric acid while cooling with ice to carry out a reaction at 10° to 120° C., preferably at 20° to 100° C., for 4 to 24 hours. The reaction solution is poured on ice water to obtain a crystal of 1-chloro-5-isoquinolinesulfonic acid.

Provenance & Evidence