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Appearance: Colorless liquid
H3PO2 50% min
H3PO3 0.3% max
SO4 0.005% max
Cl 0.015% max
Fe 5ppm max
Package: In 200L plastic drum or 1000L IBC
Hypophosphorous acid is used in the formulation of pharmaceuticals, discoloration of polymers, water treatment, retrieval of precious or non-ferrous metals. Its main use is for electroless plating; i. e. deposition of select metal films from solution on a sensitized surface. In organic chemistry, H3PO2 best known for their use in the reduction of arenediazonium salts, converting ArN2+ to Ar-H. When diazotized in a concentrated solution of hypophosphorous acid, an amine substituent can be removed from arenes, selectively over alkyl amines.
DEA List I chemical status
Because hypophosphorous acid can reduce elemental iodine to form hydroiodic acid, which is a reagent effective for reducing ephedrine or pseudoephedrine to methamphetamine, the United States Drug Enforcement Administration designated hypophosphorous acid (and its salts) as a List I precursor chemical effective November 16, 2001.  Accordingly, handlers of hypophosphorous acid or its salts in the United States are subject to stringent regulatory controls including registration, recordkeeping, reporting, and import/export requirements pursuant to the Controlled Substances Act and 21 CFR '' 1309 and 1310.
Inorganic and organic derivatives
Numerous derivatives are known in which the two hydrogen atoms directly bound to phosphorus are replaced by organic groups. These derivatives are known as phosphinic acids, and their salts as phosphinates. For example, formaldehyde and H3PO2 react to give (HOCH2)2PO2H. The reaction is akin to the addition of thiols and HCN to aldehydes. Similarly, it adds to Michael acceptors, for example with acrylamide it gives H(HO) P(O) CH2CH2C(O) NH2.
Few metal complexes have been prepared from H3PO2, one example is Ni(O2PH2)2.