Draft:Methylarsine

  • Comment: Also there are a number of invalid statements, such as arsine being a base, and the appearance muddles this with arsenic. Our Greek article suggests that it is a gas PubChem being an aggregator does not prove notability or even if it exists. Graeme Bartlett (talk) 21:21, 30 March 2026 (UTC)


Methylarsine
Names
IUPAC name
Methylarsane[1]
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/CH5As/c1-2/h2H2,1H3
    Key: IDDBICIFODFKQO-UHFFFAOYSA-N
  • C[AsH2]
Properties
CH3AsH2
Molar mass 91.973 g·mol−1
Appearance Colorless gas[2]
Odor Intense garlic[2]
Melting point −143 °C (−225 °F; 130 K)[3]
Boiling point 2 °C (36 °F; 275 K)[2][3]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Arsenic poisoning
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Tracking categories (test):

Methylarsine is an organoarsenic compound with the formula CH3AsH2. It is a colorless highly poisonous gas with a strong garlic odor.[2][4] It is the simplest organic arsine. It is the arsenic analogue of methylamine CH3NH2 and methylphosphine CH3PH2.

Methylarsine, being a compound of arsenic, carries the risk of arsenic poisoning.[1]

Synthesis

Methylarsine can be synthesized by reacting methyl chloride with potassium dihydrogen arsenide.[3]

CH3Cl + KAsH2 → CH3AsH2 + KCl

Methylarsine can also be synthesized by reduction of methylarsonic acid by sodium borohydride.[5] It can also be prepared by reduction of methylarsine dichloride (CH3AsCl2) by lithium aluminium hydride.[2]

Occurrence

Methylarsine is found in some marine biological systems. It arises as a product of volatilization of methylarsonic acid by microbial activity in the environment.[6][4]

Reactions

Methylarsine reacts with potassium metal in liquid ammonia to give potassium hydrogen methylarsenide (CH3AsH−K+).[3]

2 CH3AsH2 + 2 K → 2 CH3AsHK + H2

References

  1. ^ a b "Methylarsine". pubchem.ncbi.nlm.nih.gov. Retrieved 30 March 2026.
  2. ^ a b c d e https://www.sciencedirect.com/science/article/abs/pii/S0022286020303628
  3. ^ a b c d https://pubs.acs.org/doi/abs/10.1021/ja01289a084
  4. ^ a b https://www.sciencedirect.com/science/article/abs/pii/S0003267099008922
  5. ^ https://www.sciencedirect.com/science/article/abs/pii/S0025326X20308110

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