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| 本帖產(chǎn)生 1 個 翻譯EPI ,點擊這里進行查看 | |||
[求助]
求翻譯一個文獻里的 有機的
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Carboxylic acids, however, are difficult to hydrogenate in comparison with ketones and esters. Ligand protonation and resultant ligand dissociation, combined with overcoordination of the generated vacant sites at the metal center by the (bidentate) carboxylate conjugated base, result in detrimental catalyst deactivation. These pathways are especially problematic with first-row transition metals, which typically have weaker metal-ligand bonds than their second- and third-row congeners. 感覺兩句話自己都矛盾的。 |
木蟲 (正式寫手)
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然而,相較于酮和酯,羧酸更難加氫還原。配體質(zhì)子化和隨之發(fā)生的配體解離,以及由此產(chǎn)生的中心金屬空穴被羧基共軛堿(二齒配體)過配合導致了不利的催化劑鈍化。這些過程在第一周期過渡金屬中表現(xiàn)出尤為嚴重的問題,由于第一周期過渡金屬相對于第二和第三周期的過渡金屬形成的金屬-配體鍵更弱的緣故。 我是這樣理解的,希望能幫到你。至于你說的感覺兩句話是矛盾的,這個我倒是沒有看出來,不知道你是怎樣想的。 |
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