[Halosulfonic acid as a cyclizing agent for isoquinoline synthesis. II. Formation of the isoquinoline derivatives by the cyclization of 3,4-dimethoxybenzylideneaminoacetal with chlorosulfonic acid (author's transl)].
D000080:Acetals; D001597:Benzylidene Compounds; D003500:Cyclization; D007546:Isoquinolines / Q000138:chemical synthesis*; D013451:Sulfonic Acids
D000080:Acetals; D001597:Benzylidene Compounds; D007546:Isoquinolines; D013451:Sulfonic Acids