Access to Fully Alkylated Germanes by B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Transfer Hydrogermylation of Alkenes
作者:Sebastian Keess、Martin Oestreich
DOI:10.1021/acs.orglett.7b00672
日期:2017.4.7
Various cyclohexa-2,5-dien-1-yl-substituted germanes are shown to serve as easy-to-handle surrogates of hydrogermanes, including gaseous MeGeH3 and Me2GeH2; The Ge-H functional group is liberated by treatment with catalytic amounts of B(C6F5)(3) and participates in situ in the B(C6F5)(3)-catalyzed hydrogermylation of alkenes. The range of suitable alkenes is broad, and the overall procedure provides a convenient access to tetraalkyl-substituted germanes at room temperature. Transfer hydrogermylation of internal alkynes works equally well and selectively forms the trans or cis diastereomer depending on the electronic bias of the C C bond.