Hydrosilanes were synthesized by reduction of alkoxy silanes with BH3 in the presence of hexamethylphosphoric triamide (HMPA) as a Lewis-base catalyst. The reaction was also achieved using an inexpensive and easily handled hydride source NaBH4, which reacted with EtBr as a sacrificial reagent to form BH3in situ.
Continuous-flow Si–H functionalizations of hydrosilanes <i>via</i> sequential organolithium reactions catalyzed by potassium <i>tert</i>-butoxide
作者:Hyune-Jea Lee、Changmo Kwak、Dong-Pyo Kim、Heejin Kim
DOI:10.1039/d0gc03213a
日期:——
tri-functionalizations of unactivated hydrosilanes via serial organolithiumreactions catalyzed by earth-abundant metal compounds. Based on the screening of various additives, we found that catalytic potassium tert-butoxide (t-BuOK) facilitates the rapid reaction of organolithiums with hydrosilanes. Using a flow microreactor system, various organolithiums bearing functional groups were efficiently generated
O2 is acting! A nanosized hydroxylapatite‐supported Au nanoparticle (NP) catalyst exhibited high activity under aerobic conditions, and various silyl ethers could be obtained from diverse combinations of silanes with alcohols. Moreover, O2 was found to act not as a stoichiometric oxidizing reagent, but as a non‐consumed promoter, significantly boosting the catalytic activity of AuNPs (see figure).
O 2正在表演!纳米羟基磷灰石负载的金纳米颗粒(NP)催化剂在好氧条件下表现出高活性,并且可以通过硅烷与醇的各种组合获得各种甲硅烷基醚。此外,发现O 2并不是化学计量的氧化剂,而是非消耗型促进剂,从而大大增强了AuNPs的催化活性(见图)。
Copper‐Catalyzed Electrophilic Amination of Alkoxyarylsilanes
fluoride that serves as a base as well as an essential activator enabled a copper‐catalyzed C–N‐bond‐forming reaction between simple alkoxyarylsilanes and N‐benzoyloxyamines. This method allows the amination of simple arylsilanes bearing two or three alkoxy groups on the silicon atom.
作者:Erwin Buncel、T.Krishnan Venkatachalam U. Edlund
DOI:10.1016/0022-328x(92)83433-i
日期:1992.8
Organosilyl potassium compounds are conveniently generated by cleavage of hexaorganodisilanes with potassium t-butoxide in common solvents other than HMPA (i.e. in THF or DME). Nucleophilic attack on unsymmetrical disilanes results in formation of the more stable silyl anion, i.e. the one with the most phenyl groups bonded to silicon.