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[求助] 请教各位博学之士不惜赐教一个有关C2加氢的问题,十分感谢

He supposed that, following Horiuti-Polanyi mechanism for hydrogenation of alkenes, hydrogen atoms added to the adsorbed ethyne sequentially, and that a “half-hydrogenated state” C2H3 was formed: this can be formulated either as an ethenyl radical (a) or as an isomeric free-radical form (b). The latter could easily initiate a free-radical polymerization with an adjacent σ-diadsorbed ethyne molecule, the process would continue as long as suitably disposed ethynes were available 。

请教各位博学之士不惜赐教一个有关C2加氢的问题,十分感谢

不明白σ-diadsorbed是什么意思,以及(b)如何与其聚合的?

再次感谢各位!
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