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4,7-Dichloroquinoline was first reported in a patent filed by IG Farben in 1937. [2] However, its synthesis was not investigated in detail until chloroquine was developed as an antimalarial drug. [ 3 ] : 130–132 A route to the intermediate starting from 3-chloroaniline was developed by chemists at Winthrop Chemical Co .
[1] [4] Chloroquine is a member of the drug class 4-aminoquinoline. [1] As an antimalarial, it works against the asexual form of the malaria parasite in the stage of its life cycle within the red blood cell. [1] How it works in rheumatoid arthritis and lupus erythematosus is unclear. [1] Chloroquine was discovered in 1934 by Hans Andersag.
[3] [4] Although all risk cannot be excluded, it remains a treatment for rheumatic disease during pregnancy. [5] Hydroxychloroquine is in the antimalarial and 4-aminoquinoline families of medication. [3] Hydroxychloroquine was approved for medical use in the United States in 1955. [3] It is on the World Health Organization's List of Essential ...
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The ester group is hydrolysed by sodium hydroxide to the carboxylic acid and decarboxylation again by application of heat to 4-hydroxyquinoline. Gould–Jacobs reaction. Extension of the Gould-Jacobs approach can prepare unsubstituted parent heterocycles with fused pyridine ring of Skraup type (see Skraup reaction). [1] Further reading: [4] [5] [6]
The pyrophosphate anion has the structure P 2 O 4− 7, and is an acid anhydride of phosphate. It is unstable in aqueous solution and hydrolyzes into inorganic phosphate: P 2 O 4− 7 + H 2 O → 2 HPO 2− 4. or in biologists' shorthand notation: PP i + H 2 O → 2 P i + 2 H +