Isoprene
The isoprene is a common synonym of the chemical compound 2-methyl-1,3-butadiene. It is one of the seven isomers of pentadiene which have double combined connections. With ordinary temperature, it is a liquid colorless volatile and odorous, easily flammable suitable for form explosive mixtures with the air. It is soluble in alcohol, the Acétone, the Benzène.
This Monomère is polymerized in natural rubber. Because of its great reactivity, this Polymérisation can become explosive under the action of the temperature. The isoprene can become a polluting poison if it is present in great quantities.
Uses
The isoprene, more chemically active than the Butadiene, is very much used in chemical industry:- Cracking of Naphtha or Oil.
- production of cis-1,4-polyisoprene for synthetic rubber used in the Pneumatic S of cars.
Biological roles and effects
One finds isoprene in a natural state in the plants, the animals and the human body. The speed to which the isoprene is produced in the human body is approximately 17 Mg/day for a person weighing 70 kg. It is largely widespread in a natural state, in weak concentrations, like in many food.It often intervenes in the structure of many biological compounds. As example in the Terpène S as the Carotène (tetraterpene) which are derived from isoprene. Others derived from isoprene:
- Phytol
- Rétinol
- Vitamine has
- Dolichol S
- Vitamine E
- Squalène
- Hème
- Lanostérol
According to the U.K. Natural Environment Research Council (NERC), isoprene would be emitted by the vascular plants in the event of extreme heat by transforming nitrogen the oxide into ozone, this last irritating the throat.
Hydrocarbon found in the human body. The estimated production misses off isoprene in the human body is 15 µmol /kg/h, are equivalent to approximately 17 mg/day for has 70 kg person. Present It is widely in the natural environment At low concentrations and is also common in low concentrations in many foods.
It has common structural reason in biological systems. The terpenes (for example, the carotenes are tetraterpenes) are derived from isoprene, ace are the Terpenoid S and Coenzyme Q. Also derived from isoprene are Phytol, Retinol (Vitamin has), Tocopherol (Vitamin E), Dolichol S, and Squalene. Heme has year isoprenoid tail, and lanosterol, the sterol precursor in animals, is derived from Squalene and hence from isoprene. The functional isoprene units in biological systems are dimethylallyl pyrophosphate (DMAPP) and its isomer isopentenyl pyrophosphate (IP), which are used in the biosynthesis off derivative terpenes and lanosterol.
In virtually all organisms, isoprene derivative are synthetized by the HMG-CoA reductase pathway. Addition off thesis chains to proteins is termed Isoprenylation.
According to the United States Department off Health and Human Services Eleventh Edition Carryforward one Carcinogens, isoprene is reasonably expected to Be has human Carcinogen. Tumors cuts been observed in multiple hirings in multiple test species exposed to isoprene vapor. No adequate human studies off the relationship between isoprene exposure and human cancer cuts been reported.
According to research in 2004 by the U.K. Natural Environment Research Council (NERC), isoprene is released by Vascular seedling S in extreme hot weather, catalyzing the conversion off Nitrogen oxide, pollutant year atmospheric, to Ozone, has gas that irritates the lungs, particularly in Asthma sufferers. -->
Obtaining
It is obtained:- by synthesis starting from Hydrocarbons.
- by Dehydrogenation.
- by dimerisation of the Propylene followed by an isomerization and a demethylation.
- by action of methylpropene (isomer of the Butylene) on the formaldéhyde.
- by Cracking of the light gasolines.
See too
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