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isoprene : ウィキペディア英語版
isoprene

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Isoprene, or 2-methyl-1,3-butadiene, is a common organic compound with the formula CH2=C(CH3)CH=CH2. In its pure form, it is a colorless volatile liquid. Isoprene is produced by many plants.
==Natural occurrences==
Isoprene is produced and emitted by many species of trees (major producers are oaks, poplars, eucalyptus and some legumes). Yearly production of isoprene emissions by vegetation is around 600 million tonnes, half from tropical broadleaf trees and the remainder primarily from shrubs. This is about equivalent to methane emissions and accounts for ~1/3 of all hydrocarbons released into the atmosphere.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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