通过Au / TiO 2催化炔烃的顺式-1,2-二锗化和丙二烯的区域选择性加氢锗化反应合成乙烯基锗烷
摘要:
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。
The π-(Hydroxyalkenyl)germane Complexes Rh(acac){η<sup>2</sup>-(<i>E</i>)-Et<sub>3</sub>GeCHCHC(OH)R<sub>2</sub>}(PCy<sub>3</sub>) (R = Me, Ph) as Intermediates in the Hydrogermylation of Alkynols Catalyzed by Rh(acac)(cyclooctene)(PCy<sub>3</sub>)
作者:Miguel A. Esteruelas、Marta Martín、Luis A. Oro
DOI:10.1021/om981042n
日期:1999.5.1
The (hydroxyalkenyl)germanes (E)-R3GeCH=CHC(OH)R'(2) (R = Et, Ph; R' = Me, Ph) are prepared in quantitative yield, and in a catalytic manner, by addition of germanes to the alkynols HC=CC(OH)R'(2) (R' = Me, Ph) in the presence of the complex: Rh(acac)(cyclooctene)(PCy3). During the reactions four cycles are evident. They have as a common point the intermediates Rh(acac)eta(2)-(E)-CH(GeR3)=CHC(OH)R'(2)}(PCy3), which have been isolated for R = Et and R' = Me, Ph.