Replacing C<sub>6</sub>F<sub>5</sub> groups with Cl and H atoms in frustrated Lewis pairs: H<sub>2</sub> additions and catalytic hydrogenations
作者:K. Chernichenko、B. Kótai、M. Nieger、S. Heikkinen、I. Pápai、T. Repo
DOI:10.1039/c6dt04649e
日期:——
prepared in a few synthetic steps and demonstrated the cleavage of H2 under mild conditions. Depending on the nature of the dialkylamino group, X, and Z, the stability of the produced zwitterionic H2 adducts varies from isolated solids indefinitely stable in an inert atmosphere to those quickly equilibrating with the initial aminoborane and H2. Using a combined experimental/computational approach on a series
含有BXZ基团的2-(二烷基氨基)苯基硼烷是通过几个合成步骤制备的,其中X,Z = C 6 F 5,Cl和H,并证明在温和条件下H 2的裂解。取决于二烷基氨基基团X和Z的性质,所产生的两性离子H 2加合物的稳定性从在惰性气氛中无限稳定地分离的固体到迅速与起始氨基硼烷和H 2平衡的固体变化。使用组合的实验/计算方法,对一系列同构结构的氨基硼烷(二烷基氨基= 2,2,6,6-四甲基哌啶-1-基),证明了取代基的电负性和空间效应通常遵循趋势C 6。˚F 5〜氯»H.这个观察是针对实际应用设计新的FLP信号有用。作为一个例子,我们证明了在温和条件下炔烃加氢成顺式烯烃,这是由先前开发的C 6 F 5取代的氨基硼烷的氯类似物催化的。氨基氯硼烷或其H 2加合物中存在BHCl基团,其特征是H和Cl原子易于重新分布,并形成多氯和多氢化物。