Phosphorous acid

Base Information

• Chemical Name: Phosphorous acid
• CAS No.: 13598-36-2
• Molecular Formula: H3PO3
• Molecular Weight: 81.9958
• Hs Code.: HOSPHOROUS ACID PRODUCT IDENTIFICATION
• UN Number: 2834
• Nikkaji Number: J96.461A
• Mol file: 13598-36-2.mol

Synonyms:Phosphonsaeure;phosphorige Saeure;trihydroxidophosphorus;Phosphorous acid, ortho;O-PHOSPHOROUS ACID;trioxophosphoric(3-) acid;H2PHO3;(HO)2HPO;HPO(OH)2;hydridodihydroxidooxidophosphorus;(PHO(OH)2);P(OH)3;trihydrogen trioxophosphate(3-);DTXCID5015511;DTXCID6029674;hydridotrioxophosphoric(2-) acid;(P(OH)3);dihydrogen hydridotrioxophosphate(2-)

Chemical Property of Phosphorous acid

Chemical Property:

• Appearance/Colour: white crystalline solid
• Vapor Pressure: 0.001Pa at 20℃
• Melting Point: 73 °C
• Boiling Point: 200 °C
• PKA: pK1 1.29; pK2 6.74(at 25℃)
• Flash Point: 200°C
• PSA: 81.00000
• Density: 1.651 g/mL at 25 °C(lit.)
• LogP: -0.63930
• Storage Temp.: 0-6°C
• Sensitive.: Air Sensitive & Hygroscopic
• Water Solubility.: SOLUBLE
• XLogP3: -1.6
• Hydrogen Bond Donor Count: 2
• Hydrogen Bond Acceptor Count: 3
• Rotatable Bond Count: 0
• Exact Mass: 81.98198095
• Heavy Atom Count: 4
• Complexity: 26.3

Purity/Quality:

98%min ^*data from raw suppliers

Phosphorous acid ^*data from reagent suppliers

Safty Information:

• Pictogram(s): C
• Hazard Codes: C
• Statements: 22-35
• Safety Statements: 26-36/37/39-45

MSDS Files:

SDS file from LookChem

Useful:

• Canonical SMILES: OP(=O)O
• Description: Phosphorous acid is an intermediate in the preparation of other phosphorous compounds. It is a raw material to prepare phosphonates for water treatment such as iron and manganese control, scale inhibition and removal, corrosion control and chlorine stabilization. The alkali metal salts (phosphites) of phosphorous acid are being widely marketed either as an agricultural fungicide (e.g. Downy Mildew) or as a superior source of plant phosphorous nutrition. Phosphorous acid is used in stabilizing mixtures for plastic materials. Phosphorous acid is used for inhibiting high-temperature of corrosion-prone metal surfaces and to produce lubricants and lubricant additives. Phosphorous acid, H3PO3, is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula. Phosphorous acid is as an intermediate in the preparation of other phosphorous compounds. Because preparation and uses of “phosphorous acid” actually pertain more to the major tautomer, phosphonic acid, it is more often referred to as “phosphorous acid”. Phosphorous acid has the chemical formula H3PO3, which is best expressed as HPO(OH)2 to show its diprotic character. P(OH)3 (IUPAC: phosphorous acid) has CAS number 10294-56-1. It has been shown to be a stable tautomer.
• Physical properties: White crystalline mass; deliquescent; garlic-like odor; density 1.651 g/cm3 at 21°C; melts at 73.6°C; decomposes at 200°C to phosphine and phosphoric acid; soluble in water, about 310 g/100mL; K1 5.1x10-2 and K2 1.8x10-7; soluble in alcohol.
• Uses: Phosphorous acid is used to produce the fertilizer phosphate salt like potassium phosphite, ammonium phosphite and calcium phosphite. It is actively involved in the preparation of phosphites like aminotris(methylenephosphonic acid) (ATMP), 1-hydroxyethane 1,1-diphosphonic acid (HEDP) and 2-phosphonobutane-1,2,4-tricarboxylic Acid (PBTC), which find application in water treatment as a scale or corrosive inhibitor. It is also used in chemical reactions as a reducing agent. Its salt, lead phosphite is used as PVC stabilizer. It is also used as a precursor in the preparation of phosphine and as an intermediate in the preparation of other phosphorus compounds.

Technology Process of Phosphorous acid

There total 271 articles about Phosphorous acid which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield:

sodium carbonate monohydrate + phosphorus trichloride (7719-12-2,52843-90-0) → phosphonic Acid (13598-36-2) + phosphorus suboxide + diphosphorous acid + trichlorophosphate (10025-87-3,12599-09-6,63736-95-8,39380-77-3)

Guidance literature:

In carbon disulfide; hydrolysis of a diluted soln. of PCl3 in CS2; use of Na2CO3*H2O to generate of H2O for hydrolysis; formation of H3PO3, H4P2O5 and POCl3, P4O as by-products;;

Reference yield:

water (7732-18-5) + phosphorus trichloride (7719-12-2,52843-90-0) → phosphonic Acid (13598-36-2) + phosphorus suboxide + diphosphorous acid + trichlorophosphate (10025-87-3,12599-09-6,63736-95-8,39380-77-3)

Guidance literature:

In carbon disulfide; hydrolysis of a diluted soln. of PCl3 in CS2; use of ice at -60 °C to generate of H2O for hydrolysis; formation of H3PO3, H4P2O5 and POCl3, P4O as by-products;;

Reference yield:

bromine (7726-95-6) + phosphorus tribromide (7789-60-8) → phosphonic Acid (13598-36-2) + hydrogen bromide (10035-10-6,12258-64-9)

Guidance literature:

With water; with sufficient amt. of Br2 the main product: H3PO3;

upstream raw materials:

sodium glycinate

Dimethyl 3-(2-thienyl)-2-isoxazolin-5-ylphosphonate

2-nitro-5-(2'-nitro-4'-trifluoromethylphenoxy)-phenylphosphonic acid diethyl ester

diethyl 2-hydroxy-3-(1,2,4-triazol-1-yl)propylphosphonate

Downstream raw materials:

phosphonic acid, [[(3-nitrophenyl) ethoxyphosphinyl]methyl]-,diethyl ester

(3-(2-Benzyloxy-5-methyl-pyrazolo(1,5-a)pyrimidin-7-yl)-propylidene)bisphosphonic acid tetraethyl ester

2-methylene-4-methyl-pentanoic acid

phosphoric acid

Refernces

• 1、 Moondra, Anu,Mathur, Abha,Banerji, Kalyan K.. "Kinetics and Mechanism of the Oxidation of Phosphinic, Phenylphosphinic, and Phosphorous Acids by Pyridinium Fluorotrioxochromate(VI)". . p. 2697 - 2700. Retrieved 1990.
• 2、 Inani, Krishnadass M.,Sharma, Prem Dutt,Gupta, Yugul Kishore. "Kinetics and mechanisms of electron-transfer reactions of bismuth(V) in aqueous acidic perchlorate-fluoride media. Part 1. Oxidation of hypophosphorous acid". . p. 2571 - 2574. Retrieved 1985.
• 3、 Chapman, D. L.,Lidbury, F. A.. "". . p. 973 - 978. Retrieved 1899.
• 4、 Mistry, Dharmit,Powles, Nicholas. "The relative hydrolytic reactivities of pyrophosphites and pyrophosphates". . p. 5727 - 5733. Retrieved 2013.
• 5、 Nagori, Ratan Raj,Mehta, Mahendra,Mehrotra, Raj Narain. "". . . Retrieved 1979.
• 6、 Brooks, B. T.. "". . p. 492 - 499. Retrieved 1912.
• 7、 Mitchell, A. D.. "". . p. 629 - 635. Retrieved 1923.
• 8、 Larson, John W.. "". . p. 1071 - 1078. Retrieved 1990.
• 9、 Pessel, L.. "". . . Retrieved 1923.
• 10、 Kapoor, Surinder,Gupta, Yugul K.. "". . . Retrieved 1977.