What does dinitrophenol mean?
Dinitrophenol is the name given to any of six isomeric compounds made by attaching two nitro groups to phenol, though in practice the term almost always refers to the 2,4-isomer, a yellow crystalline solid with a distinctive musty odor. Industrially it has served in the manufacture of dyes, wood preservatives, and photographic chemicals, but it is far better known as a metabolic poison. Dinitrophenol disrupts oxidative phosphorylation, the process by which cells convert nutrients into usable energy, causing energy to be released as heat instead. This property made it briefly fashionable as a weight-loss drug in the 1930s before severe side effects — fatal fevers, cataracts, and deaths — led to its ban. It remains strictly controlled in most countries, yet continues to surface through illicit online sales, making awareness of its dangers genuinely important.
nounAny of six possible organic compounds consisting of a phenol molecule bearing two nitro groups, especially 2,4-dinitrophenol, a toxic yellow crystalline solid used industrially and notorious for its dangerous misuse as a weight-loss drug because it uncouples oxidative phosphorylation.
- A class of six isomeric compounds formed by substituting two nitro groups onto phenol, of which the 2,4-isomer is by far the best known.
- Specifically, 2,4-dinitrophenol: a yellow, toxic crystalline solid used in dyes, wood preservatives and photographic chemicals, and infamously abused as an unauthorized weight-loss agent.
"The laboratory stored its supply of dinitrophenol under strict lock after reports of the compound's misuse as a dieting aid."
"Exposure to dinitrophenol can cause profuse sweating, fever, and cataracts even at relatively low doses."
"Biochemistry students learn that dinitrophenol uncouples oxidative phosphorylation, dissipating energy as heat instead of ATP."
The plural refers to the multiple positional isomers of the compound rather than to bulk quantities.
"Chemists distinguish among the six possible dinitrophenols by the positions of their nitro groups on the ring."
Banned as a diet pill yet still bought online by desperate dieters, dinitrophenol burns fat by literally disabling your cells' ability to store energy — which is also how it can kill.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dinitrophenol
The word combines the prefix 'di-' (from Greek 'dis', meaning twice) with 'nitro-', referring to the NO2 group derived ultimately from French 'nitre' and Greek 'nitron' (saltpeter), and 'phenol', coined in the nineteenth century from Greek 'phainein', to show or shine, because of its connection to benzene-derived compounds. The name thus literally signals 'a phenol bearing two nitro groups'. Related English words sharing these roots include nitrate, nitrite, and phenolic.
Related word forms
How dinitrophenol is actually used
Strictly technical and scientific register; outside chemistry and medicine it appears mainly in news coverage of poisoning cases or discussions of banned substances. The unmodified form usually refers to the 2,4-isomer, so more specific names such as 2,4-dinitrophenol are used when precision matters. It carries strongly negative connotations owing to its toxicity.
Easily confused with dinitrophenol
Phenol is the parent compound C6H5OH, whereas dinitrophenol is a derivative of it carrying two additional nitro groups.
Dinitrogen is molecular nitrogen (N2), an inert atmospheric gas, while dinitrophenol is a toxic aromatic compound containing two nitro groups.