Alternative Synthesis of (Z)-1-Aryl-1-(tributylstannyl)-2-(triethylgermyl)ethenes and the Unprecedented Germyl 1,2-Migration during the Destannylation of the Adducts
Addition of nitrile oxides to germyl-substituted ethylenes
作者:E Lukevics、P Arsenyan、S Belyakov、J Popelis
DOI:10.1016/s0022-328x(98)00419-7
日期:1998.5
The reactions of [2+3] cycloaddition of nitrileoxides to mono- and 1,2-disubstituted germylalkenes proceed regioselectively and resulted 5-Ge-substituted isoxazolines-2 from triethylvinyl- and triethylallylgermane and 4-Ge-isomers from β-triorganylgermylstyrene and ethyl triorganylgermylacrylates. In the latter case the reaction occurs stereospecifically: Z-germylalkenes give cis-, while E-germylalkenes
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.