Scheme 3. Substrate scope for the coupling of olefins with 2a. Standard conditions: 4 (0.3 mmol), 2a (1.5 equiv.), Ph3C+BF4− (1.7 equiv.), sym-collidine (1.8 equiv.), [Cp*Fe(CO)2(thf)]+BF4− (20 mol%), PhCF3 (0.2 M), 60 °C, 48 h. aCpR1Fe(CO)2(thf)BF4 (20 mol%) was used as the iron catalyst, PhCF3 (0.3 M). CpR1 = 1,3-(t-Bu)2cyclopentadienyl.
