Boryltrihydroborate: Synthesis, Structure, and Reactivity as a Reductant in Ionic, Organometallic, and Radical Reactions
作者:Kyoko Nozaki、Yoshitaka Aramaki、Makoto Yamashita、Shau-Hua Ueng、Max Malacria、Emmanuel Lacôte、Dennis P. Curran
DOI:10.1021/ja105277u
日期:2010.8.25
dimer lacks the bridging B-H bonds seen in neutral boranes and is instead held together by ionic Li---HB interactions. A preliminary scan of reactions with several iodides shows that the compound participates in an ionicreduction (with a primary-alkyl iodide), an organometallicreduction (Pd-catalyzed with an aryl iodide), and a radical reduction (AIBN-initiated with a sugar-derived iodide). Accordingly
Catalytic Borylation using an Air-Stable Zinc Boryl Reagent: Systematic Access to Elusive Acylboranes
作者:Jesús Campos、Simon Aldridge
DOI:10.1002/anie.201507627
日期:2015.11.16
The use of borylzinc reagents in palladium‐catalyzed borylation chemistry is described (i.e. a boron analogue of the Negishi coupling), including a one‐pot bench‐top protocol using an air‐ and moisture‐stable bis(boryl)zinc reagent. The steric/electronic properties of the boryl fragment employed enable a systematic method for accessing acylboranes, a rare class of organoboron species with great potential
the nitrogen atoms, also allowed generation of the corresponding boryllithium. The solid state structures of boryllithium showed that the boron-lithium bond is polarized where the boron atom is anionic in all (35a x DME)(2), 35a x (THF)(2), 35b x (THF)(2), and 35c x (THF)(2) when compared to the structures of hydroborane 38a-c and optimized free boryl anion opt-46a-c. Dissolution of the isolated single
合成了一系列硼基阴离子锂盐,硼基锂,并通过核磁共振光谱和晶体分析进行表征。除了母体硼基锂化合物 35a 之外,硼基锂的结构改性,在五元环中使用饱和的 CC 和苄环化的 C=C 主链和氮原子上的均三甲苯基团,也允许产生相应的硼基锂。硼锂的固态结构表明硼-锂键是极化的,其中硼原子是阴离子的 (35a x DME)(2), 35a x (THF)(2), 35b x (THF)(2),和 35c x (THF)(2) 与氢硼烷 38a-c 和优化的游离硼酸阴离子 opt-46a-c 的结构相比。(35a x DME)(2) 和 35a x (THF)(2) 在 THF-d(8) 中的孤立单晶的溶解表明硼-锂键仍然存在于溶液中,并且观察到游离的 DME 或 THF 分子。在 THF-d(8) 或甲基环己烷-d(14) 中观察到 35a 的温度相关 (11) B NMR 化学位移变化,表明硼中心周围
Enabling and Probing Oxidative Addition and Reductive Elimination at a Group 14 Metal Center: Cleavage and Functionalization of E–H Bonds by a Bis(boryl)stannylene
作者:Andrey V. Protchenko、Joshua I. Bates、Liban M. A. Saleh、Matthew P. Blake、Andrew D. Schwarz、Eugene L. Kolychev、Amber L. Thompson、Cameron Jones、Philip Mountford、Simon Aldridge
DOI:10.1021/jacs.6b00710
日期:2016.4.6
for protic and hydridic E-H bonds (N-H/O-H, Si-H/B-H, respectively). In the case of ammonia (and water, albeit more slowly), E-H oxidative addition can be shown to be followed by reductive elimination to give an N- (or O-)borylated product. Thus, in stoichiometric fashion, redox-based bond cleavage/formation is demonstrated for a single main group metal center at room temperature. From a mechanistic
Approaching a “Naked” Boryl Anion: Amide Metathesis as a Route to Calcium, Strontium, and Potassium Boryl Complexes
作者:Andrey V. Protchenko、Petra Vasko、M. Ángeles Fuentes、Jamie Hicks、Dragoslav Vidovic、Simon Aldridge
DOI:10.1002/anie.202011839
日期:2021.1.25
Amide metathesis has been used to generate the first structurally characterized borylcomplexes of calcium and strontium, (Me3Si)2N}MB(NDippCH)2}(thf)n (M=Ca, n=2; M=Sr, n=3), through the reactions of the corresponding bis(amides), MN(SiMe3)2}2(thf)2, with (thf)2Li‐ B(NDippCH)2}. Most notably, this approach can also be applied to the analogous potassium amide KN(SiMe3)2}, leading to the formation