Tetraethyl pyrophosphate

Tetraethyl pyrophosphate is a highly toxic organophosphate that inhibits acetylcholinesterase. It was formerly used as an insecticide.

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Acetylcholinesterase: An enzyme that breaks down the neurotransmitter acetylcholine at cholinergic synapses. Tetraethyl pyrophosphate inhibits this enzyme, causing acetylcholine to accumulate.
Insecticide: A substance used to kill insects or prevent them from causing damage. Tetraethyl pyrophosphate was developed and used as an insecticide.
Organophosphorus chemistry: The chemistry of compounds containing bonds between phosphorus and carbon or other elements. Tetraethyl pyrophosphate belongs to the broader chemistry of organophosphorus compounds.
Carbamate insecticide: An insecticide containing a carbamate group, often acting through reversible acetylcholinesterase inhibition. Carbamates affect the same enzyme but generally inhibit it through a different chemical interaction.
Acetylcholine: A neurotransmitter used by neurons at neuromuscular junctions and throughout the nervous system. Its buildup after enzyme inhibition drives the compound’s acute effects.
Parathion: An organophosphate insecticide that inhibits acetylcholinesterase and is highly toxic to humans. It became a widely used alternative within the same hazardous insecticide class.
Pyrophosphoric acid: An acid containing two linked phosphate groups joined by an oxygen atom. Its linked phosphate framework underlies the compound’s pyrophosphate name and structure.
Organochlorine insecticide: An insecticide containing chlorine that commonly disrupts insect nerve signaling by mechanisms unlike organophosphates. This major insecticide class acts on different neural targets.
Organophosphate poisoning: Poisoning caused by organophosphate compounds that disrupt cholinesterase activity. This broader toxicological syndrome includes exposure to tetraethyl pyrophosphate.
Malathion: An organophosphate insecticide whose toxicity to mammals is lower than that of many related compounds. Its comparatively lower mammalian toxicity illustrates a different balance of insecticidal efficacy and risk.