Scheme 5.
Oxidative dimerization of 16 b. a) LHMDS, HMPA, THF, 78°C, 2 h; then [Cp2FePF6], −60°C, 72 h, 80 %; b) [PdCl2(PPh 3)2], nBu3SnH, AcOH, CH2Cl2, 0°C, 30 min, 90 %.
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