Methylphosphinic acid

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Methylphosphinic acid
Preferred IUPAC name
Methylphosphinic acid
3D model (JSmol)
ECHA InfoCard 100.021.933 Edit this at Wikidata
EC Number
  • 224-125-7
  • InChI=1S/CH5O2P/c1-4(2)3/h4H,1H3,(H,2,3)
  • CP(=O)O
Molar mass 80.023 g·mol−1
Related compounds
Related compounds
dimethylphosphinic acid
methylphosphonic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Methylphosphinic acid is a monobasic acid, the simplest of the phosphinic acids. A central phosphorus atom is connected to a hydroxy group, a hydrogen atom, a methyl group and an oxygen. Derivatives of methylphosphinic acid can have the phosphorus connected hydrogen atom replaced by other organic groups. In early days what is now called methylphosphonic acid was also called methylphosphinic acid.[1]


Methylphosphinic acid can be produced by the hydrolysis of dimethyl methylphosphonate, which is conveniently obtained from trimethylphosphite.[2]

Hydrolysis of methyldichlorophosphine yields methylphosphinic acid,[3]

Methylphosphinic acid is a common byproduct of the hydrolysis of various CH3P-containing esters and amides, as occur in pesticides for example.[4][5]


Rat oral LD50 value for methylphosphinic acid is 940 mg/kg.[4]


  • (1,2,5,6-Tetrahydropyridin-4-yl)methylphosphinic acid TPMPA
  • N-methylaminomethane-P-methylphosphinic acid[6] or N-methylamino-methyl-methylphosphinic acid[7]
  • Ethane-1,2-diylbis(methylphosphinic acid)[8]
  • (3-amino-2-hydroxypropyl)methylphosphinic acid
  • Methylphosphinic acid ethyl ester (CAS number 16391-07-4)
  • dimethylphosphoryloxy-methylphosphinic acid
  • N,N-dimethylaminomethane-P-methylphosphinic acid[6]
  • (Aminomethyl)methylphosphinic acid 15901-11-8
  • (2-aminobenzyl)-methylphosphinic acid[9]
  • (6-amino-3-ethyl-1H-benzimidazol-3-ium-2-yl)-methylphosphinic acid
  • [(2S,3S)-3-(methoxymethyl)pentan-2-yl]oxy-methylphosphinic acid
  • (3-Aminocyclopentyl)methylphosphinic acid[10]
  • methylene-di(methylphosphinic acid)


  1. ^ A. W. Hofman (1872). "New Researches on the Phosphorus Bases". The Chemical News and Journal of Industrial Science: 245–246.
  2. ^ Crofts, Peter C.; Kosolapoff, Gennady M. (1953). "Preparation and Determination of Apparent Dissociation Constants of Some Alkylphosphonic and Dialkylphosphinic Acids1". Journal of the American Chemical Society. 75 (14): 3379–3383. doi:10.1021/ja01110a024.
  3. ^ Geissbühler, H.; Brooks, G. T.; Kearney, P. C. (2013). Synthesis of Pesticides Chemical Structure and Biological Activity Natural Products with Biological Activity: Symposia Papers Presented at the Fourth International Congress of Pesticide Chemistry, Zurich, Switzerland, July 24-28, 1978. Elsevier. p. 114. ISBN 9781483278513.
  4. ^ a b Watson, Rebecca E.; Hafez, Ahmed M.; Kremsky, Jonathan N.; Bizzigotti, George O. (December 2016). "Toxicity of Binary Chemical Munition Destruction Products: Methylphosphonic Acid, Methylphosphinic Acid, 2-Diisopropylaminoethanol, DF Neutralent, and QL Neutralent". International Journal of Toxicology. 26 (6): 503–512. doi:10.1080/10915810701707551. PMID 18066966. S2CID 8372615.
  5. ^ "Process for the preparation of halo-methylphosphinic acid halides". 30 November 1973.
  6. ^ a b Grela, Ewa; Dziełak, Anna; Szydłowska, Katarzyna; Mucha, Artur; Kafarski, Paweł; Grabowiecka, Agnieszka Monika (18 October 2016). "Whole-cell Proteus mirabilis urease inhibition by aminophosphinates for the control of struvite formation". Journal of Medical Microbiology. 65 (10): 1123–1129. doi:10.1099/jmm.0.000342. PMID 27550502.
  7. ^ Maier, Ludwig (October 1991). "Organic Phosphorus Compounds 98.1Synthesis and Properties of N-Methylaminomethylphosphonic Acid and Derivatives". Phosphorus, Sulfur, and Silicon and the Related Elements. 62 (1–4): 29–34. doi:10.1080/10426509108034455.
  8. ^ Reiss, Guido J.; Engel, Judith S. (9 January 2008). "Ethane-1,2-diylbis(methylphosphinic acid)". Acta Crystallographica Section E. 64 (2): o400. doi:10.1107/S1600536807068122. PMC 2960156. PMID 21201428.
  9. ^ Collins, DJ; Drygala, PF; Swan, JM (1983). "Organophosphorus compounds. XIX. Synthesis of 2,3-Dihydro-1 H-1,2-benzazaphosphole 2-oxides, variously substituted on nitrogen and phosphorus, by N-P cyclization of zwitterionic intermediates". Australian Journal of Chemistry. 36 (12): 2517. doi:10.1071/CH9832517.
  10. ^ Chebib, Mary; Hanrahan, Jane R.; Kumar, Rohan J.; Mewett, Kenneth N.; Morriss, Gwendolyn; Wooller, Soraya; Johnston, Graham A.R. (March 2007). "(3-Aminocyclopentyl)methylphosphinic acids: Novel GABAC receptor antagonists". Neuropharmacology. 52 (3): 779–787. doi:10.1016/j.neuropharm.2006.09.014. PMID 17098260. S2CID 15100966.