Hexane-2,5-dione
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2,5-Hexanedione (Acetonylacetone) is an aliphatic diketone. It is a colorless liquid.[1] In humans, it is a toxic metabolite of hexane and of 2-hexanone.
Symptoms of poisoning
The chronic toxicity of hexane is attributed to hexane-2,5-dione. The symptoms are tingling and cramps in the arms and legs, followed by general muscular weakness. In severe cases, atrophy of the skeletal muscles is observed, along with a loss of coordination and vision problems.[2]
Similar symptoms are observed in animal models. They are associated with a degeneration of the peripheral nervous system (and eventually the central nervous system), starting with the distal portions of the longer and wider nerve axons.
Mechanism of action
2,5-Hexanedione reacts with lysine residues in axonal proteins by Schiff base formation followed by cyclization to give pyrroles. Oxidation of the pyrrole residues then causes cross-linking and denaturation of proteins, which perturbs axonal transport and function and causes damage to nerve cells.[3]
Synthesis
2,5-Hexanedione has been prepared in several ways.[4] A common method involves hydrolysis of 2,5-dimethylfuran, a glucose derived heterocycle.[1]
Uses
Acetonylacetone can be used in the synthesis of isocarboxazid,[5] rolgamidine,[6] and mopidralazine. Treatment with P4S10 gives 2,5-dimethylthiophene.
References
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- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Couri D, Milks M. "Toxicity and metabolism of the neurotoxic hexacarbons n-hexane, 2-hexanone, and 2,5-hexanedione" Annu. Rev. Pharmacol. Toxicol. 1982;22:145-66.
- ↑ Template:Ullmann
- ↑ http://www.prepchem.com/synthesis-of-2-5-hexanedione/ Primary: Systematic organic chemistry, by W. M. Cumming, 194, 1937.
- ↑ U.S. patent 2908688
- ↑ U.S. patent 4140793
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