Fig. 3: The scope of alkenes and germanium reagentsa.

aReaction conditions: 1a (0.3 mmol), 2 (0.45 mmol), 3 (0.45 mmol), NiBr2 (10 mol%), Mn (0.9 mmol), DMA (3 mL), 35 °C, 36 h, N2 atmosphere. Isolated yield was shown. bL5 (12 mol%) was used as the additive. cNiBr2 (15 mol%), L5 (20 mol%) was used at 50 °C, 60 h. dNiBr2 (15 mol%) was used. EWG electron-withdrawing group, Bn benzyl, Cy cyclohexyl, tBu tert-butyl.