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愛(ài)笑的阿里木蟲(chóng) (小有名氣)
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[求助]
英譯漢（一段中的兩句話）
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nature某篇文章其中一段，幫忙翻譯一下標(biāo)紅的地方，盡量精確點(diǎn)，前后文已經(jīng)給出，非常感謝 Several anilines important for both organic synthesis and industry are densely substituted with a variety of different functional groups. Hence, for a generally applicable catalyst system it is essential to perform the reduction of the nitro group highly chemoselectively. Notably, such functional-group tolerance might also omit the use of protecting groups and streamline more-complex syntheses. Especially with respect to selectivity, the reduction of -NO2 in the presence of other reducible substituents, such as ketones, aldehydes, alkenes or alkynes, remains challenging. Most common commercially available Raney–nickel, palladium or platinum catalysts are troubled by these issues. Nevertheless, Siegrist, Blaser and co-workers achieved the selective reduction of substituted nitroarenes using commercially available platinum catalysts modified by special additives. More recently, another important development came from the group of Corma, who disclosed a heterogeneous gold-based catalyst that can hydrogenate nitro compounds selectively in the presence of a number of functional groups. Nevertheless, so far there exists no inexpensive nonnoble metal catalyst system that allows for a general reduction of all kinds of nitroarenes. |
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愛(ài)笑的阿里
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3樓2014-12-22 21:14:20
2樓2014-12-22 19:55:12
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Notably, such functional-group tolerance might also omit the use of protecting groups and streamline more-complex syntheses. Especially with respect to selectivity, the reduction of -NO2 in the presence of other reducible substituents, such as ketones, aldehydes, alkenes or alkynes, remains challenging. 值得注意的是，這種官能團(tuán)的耐受性也可能不用（或省略）使用保護(hù)基團(tuán)，并簡(jiǎn)化更復(fù)雜的合成。尤其就選擇性（而言），在酮、醛、烯烴或炔烴等其它可被還原取代基存在的條件下還原-NO2仍然具有挑戰(zhàn)性。 |
4樓2014-12-22 22:31:31
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