allene
plural of dead tree
present participle of desexualise
plural of corn crake
(organic chemistry) Any of a class of hydrocarbons having two double bonds from one carbon atom to two others - R₂C=C=CR₂; especially the parent compound CH₂=C=CH₂ (propadiene).
機構研究の過程で、化学者は一つの炭素原子が二つの炭素と二重結合を持つ炭化水素(R₂C=C=CR₂)、つまりアレンの短命な中間体を検出し、それは急速に付加環化反応を起こした。
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