Regioselective Diboration and Silaboration of Allenes Catalyzed by Au Nanoparticles
作者:Marios Kidonakis、Manolis Stratakis
DOI:10.1021/acscatal.7b04084
日期:2018.2.2
available supported Au nanoparticles on TiO2 (1 mol %), terminal allenes undergo diboration and silaboration exclusively on the terminal double bond, in high yields and stereoselectivity. In silaboration, the boron moiety (Bpin) is attached on the terminal carbon and the silyl group on the sp-C, a regioselectivity pattern that is unusual. No ligands or additives are required, while the catalyst is recyclable
Synthesis of Vinylgermanes via the Au/TiO<sub>2</sub>-Catalyzed <i>cis</i>-1,2-Digermylation of Alkynes and the Regioselective Hydrogermylation of Allenes
作者:Anastasia Louka、Manolis Stratakis
DOI:10.1021/acs.orglett.1c00997
日期:2021.5.7
In the presence of Au/TiO2 (1 mol %), terminal alkynes react quantitatively with stoichiometric amounts of the unactivated digermane Me3Ge-GeMe3, forming exclusively cis-1,2-digermylated alkenes. We also establish the Au/TiO2-catalyzed hydrogermylation of terminal allenes with Et3GeH, which exhibits a highlyregioselective mode of addition on the more substituted double bond forming vinylgermanes.
在Au / TiO 2(1 mol%)的存在下,末端炔烃与化学计量的未活化的Digermane Me 3 Ge-GeMe 3进行定量反应,仅形成顺式-1,2-二聚二甲基化的烯烃。我们还建立了用Et 3 GeH的Au / TiO 2催化的末端烯丙基加氢麦芽酰化反应,该化合物在形成更多取代的双键的乙烯基锗烷上表现出高度的区域选择性加成模式。此外,我们提供了有关Pd纳米颗粒催化的1,2-二聚二甲基烯烃与碘代芳烃的CC偶联的初步结果。
Vinylallenes
作者:Rene Baudouy、Françoise Delbecq、Jacques Gore
DOI:10.1016/s0022-328x(00)92330-1
日期:1979.9
Five substituted vinylallenes were metallated at −70°C with butyllithium in THF/ether (50/50). The resulting metal compounds react with alkyl halides under formation of vinylallenes, which are substituted at the terminal C atom of the allene. Functionalized vinylallenic compounds are also obtained by the reactions of the same metal compound with electrophiles (aldehydes, ketones, amides, CO2, etc.)