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ethenium
In chemistry, ethenium or protonated ethylene is a positive ion with formula . It can be viewed as a molecule of ethylene with an added proton , or a molecule of ethane minus an hydride ion . It is a carbocation; more specifically, a carbenium ion.
==Preparation==
Ethenium has been observed in rarefied gases subjected to radiation.〔 Another preparation method is the reaction of certain proton donors such as , , , and with ethane at ambient temperature and pressures below 1 mmHg. (Other donors such as and will form ethanium preferably to ethenium.)〔
At room temperature and in a rarefied methane atmosphere, ethanium slowly dissociates to ethenium and . The reaction is much faster at 90 °C.〔
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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