EA-1356

Last updated
EA-1356
EA-1356 Structure.svg
Names
Preferred IUPAC name
2-Methylcyclohexyl methylphosphonofluoridate
Other names
Methyl cyclosarin [1]
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/C8H16FO2P/c1-7-5-3-4-6-8(7)11-12(2,9)10/h7-8H,3-6H2,1-2H3
    Key: YBZCCTLVJWWETH-UHFFFAOYSA-N
  • CC1CCCCC1OP(=O)(C)F
Properties
C8H16FO2P
Molar mass 194.186 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

EA-1356 is an organophosphate nerve agent of the G-series. [2] [3] It is highly resistant to enzymatic degradation in the body. [4] The nerve agent was tested at Edgewood Arsenal in Maryland (the "EA" in "EA-1356") among many other chemicals tested on humans. A novel enzyme was patented by the US Army in 2018 to break down EA-1356. It is a schedule 1 substance by the Chemical Weapons Convention standards. It is under the category of munitions of ML7.b.1.a.

Related Research Articles

Nerve agents, sometimes also called nerve gases, are a class of organic chemicals that disrupt the mechanisms by which nerves transfer messages to organs. The disruption is caused by the blocking of acetylcholinesterase (AChE), an enzyme that catalyzes the breakdown of acetylcholine, a neurotransmitter. Nerve agents are irreversible acetylcholinesterase inhibitors used as poison.

<span class="mw-page-title-main">Sarin</span> Chemical compound and chemical warfare nerve agent

Sarin is an extremely toxic organophosphorus compound. A colourless, odourless liquid, it is used as a chemical weapon due to its extreme potency as a nerve agent. Exposure can be lethal even at very low concentrations, where death can occur within one to ten minutes after direct inhalation of a lethal dose, due to suffocation from respiratory paralysis, unless antidotes are quickly administered. People who absorb a non-lethal dose and do not receive immediate medical treatment may suffer permanent neurological damage.

3-Quinuclidinyl benzilate (QNB) is an odorless and bitter-tasting military incapacitating agent. BZ is an antagonist of muscarinic acetylcholine receptors whose structure is the ester of benzilic acid with an alcohol derived from quinuclidine.

<span class="mw-page-title-main">Soman</span> Chemical compound (nerve agent)

Soman is an extremely toxic chemical substance. It is a nerve agent, interfering with normal functioning of the mammalian nervous system by inhibiting the enzyme cholinesterase. It is an inhibitor of both acetylcholinesterase and butyrylcholinesterase. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations according to UN Resolution 687. Its production is strictly controlled, and stockpiling is outlawed by the Chemical Weapons Convention of 1993 where it is classified as a Schedule 1 substance. Soman was the third of the so-called G-series nerve agents to be discovered along with GA (tabun), GB (sarin), and GF (cyclosarin).

<span class="mw-page-title-main">VX (nerve agent)</span> Chemical compound and chemical warfare nerve agent

VX is an extremely toxic synthetic chemical compound in the organophosphorus class, specifically, a thiophosphonate. In the class of nerve agents, it was developed for military use in chemical warfare after translation of earlier discoveries of organophosphate toxicity in pesticide research. In its pure form, VX is an oily, relatively non-volatile liquid that is amber-like in colour. Because of its low volatility, VX persists in environments where it is dispersed.

Novichok is a family of nerve agents, some of which are binary chemical weapons. The agents were developed at the GosNIIOKhT state chemical research institute by the Soviet Union and Russia between 1971 and 1993. Some Novichok agents are solids at standard temperature and pressure, while others are liquids. Dispersal of solid form agents is thought possible if in ultrafine powder state.

Chemical, biological (CB) — and sometimes radiological — warfare agents were assigned what is termed a military symbol by the U.S. military until the American chemical and biological weapons programs were terminated. Military symbols applied to the CB agent fill, and not to the entire weapon. A chemical or biological weapon designation would be, for example, "Aero-14/B", which could be filled with GB, VX, TGB, or with a biological modification kit – OU, NU, UL, etc. A CB weapon is an integrated device of (1) agent, (2) dissemination means, and (3) delivery system.

<span class="mw-page-title-main">Diisopropyl fluorophosphate</span> Chemical compound

Diisopropyl fluorophosphate (DFP) or Isoflurophate is an oily, colorless liquid with the chemical formula C6H14FO3P. It is used in medicine and as an organophosphorus insecticide. It is stable, but undergoes hydrolysis when subjected to moisture.

<span class="mw-page-title-main">Edgewood Arsenal human experiments</span> US military chemical warfare research

From 1948 to 1975, the U.S. Army Chemical Corps conducted classified human subject research at the Edgewood Arsenal facility in Maryland. These experiments began after the conclusion of World War II, and continued until the public became aware of the experiments, resulting in significant outcry. The purpose was to evaluate the impact of low-dose chemical warfare agents on military personnel and to test protective clothing, pharmaceuticals, and vaccines. A small portion of these studies were directed at psychochemical warfare; grouped under the title "Medical Research Volunteer Program" (1956–1975), driven by intelligence requirements and the need for new and more effective interrogation techniques.

<span class="mw-page-title-main">GV (nerve agent)</span> Chemical compound

GV, also known as EA-5365, is an organophosphate nerve agent. GV is a part of a new series of nerve agents with properties similar to the "G-series" and "V-series". It is a potent acetylcholinesterase inhibitor with properties similar to other nerve agents, being a highly poisonous vapour. Treatment for poisoning with GV involves drugs such as atropine, benactyzine, obidoxime, and HI-6.

<span class="mw-page-title-main">EA-3167</span> Anticholinergic deliriant drug

EA-3167 is a potent and long-lasting anticholinergic deliriant drug, related to the chemical warfare agent 3-quinuclidinyl benzilate (QNB) and to the bronchodilator drug tiotropium bromide. It was developed under contract to Edgewood Arsenal during the 1960s as part of the US military chemical weapons program, in an attempt to develop non-lethal incapacitating agents. EA-3167 has identical effects to QNB, but is even more potent and longer-lasting, with an effective dose when administered by injection of as little as 2.5 μg/kg, and a duration of 120–240 hours. However unlike QNB, EA-3167 was never weaponized or manufactured in bulk.

<span class="mw-page-title-main">Cholinesterase inhibitor</span> Chemicals which prevent breakdown of acetylcholine and butyrylcholine

Cholinesterase inhibitors (ChEIs), also known as anti-cholinesterase, are chemicals that prevent the breakdown of the neurotransmitter acetylcholine or butyrylcholine by cholinesterase. This increases the amount of the acetylcholine or butyrylcholine in the synaptic cleft that can bind to muscarinic receptors, nicotinic receptors and others. This group of inhibitors is divided into two subgroups, acetylcholinesterase inhibitors (AChEIs) and butyrylcholinesterase inhibitors (BChEIs).

<span class="mw-page-title-main">Tetraethyl pyrophosphate</span> Chemical compound

Tetraethyl pyrophosphate, abbreviated TEPP, is an organophosphate compound with the formula [(C2H5O)2P(O)]2O. It is the tetraethyl derivative of pyrophosphate (P2O74-). It is a colorless oil that solidifies near room temperature. It is used as an insecticide. The compound hydrolyzes rapidly.

Organophosphorus acid anhydrolase (OPAA) is an enzyme that been shown to be particularly effective in detoxifying organophosphorus-containing compounds, such as deadly nerve gas used in chemical warfare. The enzyme is found in a diverse range of organisms, including protozoa, squid and clams, mammals, and soil bacteria. A highly active form of the enzyme is typically isolated from the marine bacteria Alteromonas undina for laboratory study. This form is both halophilic and thermophilic, making it particularly useful for detoxification applications. A slightly less active variant of OPAA has also been isolated in mung beans and slime mold duckweed.

<span class="mw-page-title-main">EA-3990</span> Chemical compound

EA-3990 is a deadly carbamate nerve agent. It is lethal because it inhibits acetylcholinesterase. Inhibition causes an overly high accumulation of acetylcholine between the nerve and muscle cells. This paralyzes the muscles by preventing their relaxation. The paralyzed muscles include the muscles used for breathing.

<span class="mw-page-title-main">EA-4056</span> Chemical compound

EA-4056 is a deadly carbamate nerve agent. It is lethal because it inhibits acetylcholinesterase. Inhibition causes an overly high accumulation of acetylcholine between the nerve and muscle cells. This paralyzes the muscles by preventing their relaxation. The paralyzed muscles includes the muscles used for breathing.

<span class="mw-page-title-main">Chlorosoman</span> Chemical compound

Chlorosoman is a chlorine analog of soman. It is a highly toxic organophosphorus compound and used as the precursor substance for soman nerve agent. Its physical properties are estimated. Soman is insoluble in water, with a boiling point of 223 degrees Celsius and a melting point of -27 degrees Celsius. Chlorosoman is at least 2.5x less toxic than its analogue.

V-sub x, also known as GD-7, is an organophosphate nerve agent of the V-series, the phosphonate analog of the organophosphate insecticide demeton. EA-5478 is the pinacolyl analogue.

<span class="mw-page-title-main">Crotylsarin</span> Chemical compound

Crotylsarin (CRS) is an extremely toxic organophosphate nerve agent of the G-series. Like other nerve agents, CRS irreversibly inhibits acetylcholinesterase. However, since the inhibited enzyme ages so rapidly, it can't be reactivated by cholinesterase reactivators.

<span class="mw-page-title-main">Methylfluorophosphonylcholine</span> Chemical compound

Methylfluorophosphonylcholine (MFPCh) is an extremely toxic chemical compound related to the G-series nerve agents. It is an extremely potent acetylcholinesterase inhibitor which is around 100 times more potent than sarin at inhibiting acetylcholinesterase in vitro, and around 10 times more potent in vivo, depending on route of administration and animal species tested. MFPCh is resistant to oxime reactivators, meaning the acetylcholinesterase inhibited by MFPCh can't be reactivated by cholinesterase reactivators. MFPCh also acts directly on the acetylcholine receptors. MFPCh is a relatively unstable compound and degrades rapidly in storage, so despite its enhanced toxicity it was not deemed suitable to be weaponised for military use.

References

  1. Noga, M.; Michalska, A.; Jurowski, K. (2024). "The estimation of acute oral toxicity (LD(50)) of G-series organophosphorus-based chemical warfare agents using quantitative and qualitative toxicology in silico methods". Archives of Toxicology. doi:10.1007/s00204-024-03714-5. PMID   38493428.
  2. Söderström MT, Ketola RA, Kostiainen O (1995). "Identification of some nerve agent homologues and dialkyl methylphosphonates by gas chromatography/Fourier transform infrared spectrometry". Fresenius' Journal of Analytical Chemistry. 352 (6): 550–556. doi:10.1007/BF00323072. S2CID   100910978.
  3. Ellison DH (2008). Handbook of Chemical and Biological Warfare Agents (Second ed.). CRC Press. ISBN   978-0-849-31434-6.
  4. US 10124043,Harvey SP, Guelta MA, McMahon LR,"Mutant OPAA enzymes with increased catalytic efficiency on organophosphorus compound EA1356",issued 13 November 2018, assigned to U.S. Army Edgewood Chemical Biological Center