The inside cover picture, designed by Lakshman and co‐workers, illustrates a diverse set of hydrogenations that can be conducted without use of external hydrogen gas (compressed gas). 4‐Methylmorpholine (NMM), tetrahydroxydiboron [B₂(OH)₄], and 5% Pd on charcoal work in concert to cause reductions of aryl halides and triflates, alkenes, alkynes, aldehydes, and azides, as well as cleavage of benzylic ethers and N‐Cbz groups. Based on the mechanistic knowledge gained in the study, aromatic deuteriations have also been accomplished using N,N‐bis(methyl‐d₃)pyridin‐4‐amine (DMAP‐d₆) and B₂(OD)₄. H₂ gas appears to be formed in these reactions and this has been observed by ¹H NMR and GC analysis. Details of this work can in found in the full paper on pages 166–176 (K. A. Korvinson, H. K. Akula, C. T. Malinchak, D. Sebastian, W. Wei, T. A. Khandaker, M. R. Andrzejewska, B. Zajc, M. K. Lakshman, Adv. Synth. Catal. 2020, 362, 166–176; DOI: 10.1002/adsc.201901099).

中文翻译：

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在没有外部氢气的情况下进行催化还原：使用四羟基二硼和叔胺进行大范围加氢

由Lakshman及其同事设计的内页封面图片展示了可以在不使用外部氢气（压缩气体）的情况下进行的多种氢化反应。4-甲基吗啉（NMM），四羟基二硼[B ₂（OH）₄ ]和5％的钯在木炭上协同作用，导致芳基卤化物和三氟甲磺酸酯，烯烃，炔烃，醛和叠氮化物的还原，以及苄基的裂解醚和N- Cbz基团。根据研究中获得的机理知识，还可以使用N，N-双（甲基-d ₃）吡啶-4-胺（DMAP- d ₆）实现芳族氘化）和B ₂（OD）₄。在这些反应中似乎形成了H ₂气体，这已通过¹ H NMR和GC分析观察到。这项工作的详细信息可以在第166-176页的全文中找到（KA Korvinson，HK Akula，CT Malinchak，D.Sebastian，W.Wei，TA Khandaker，MR Andrzejewska，B.Zajc，MK Lakshman，Adv.Synth 。CATAL。2020，362，166-176; DOI：10.1002 / adsc.201901099）。