MS 4 Angstroem; zinc trifluoromethanesulfonate in toluene T=90°C; 3 h;

cis,cis,cis-tetrakis[(diphenylphosphanyl)methyl]cyclopentane; potassium carbonate; bis(η3-allyl-μ-chloropalladium(II)) in xylene T=130°C; Suzuki reaction; 20 h;

pyridine; trichlorophosphate in dichloromethane T=0 - 25°C;

potassium phosphate; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran

1.1: n-BuLi / tetrahydrofuran; hexane / -78 °C 1.2: 78 percent / tetrahydrofuran; hexane / -78 °C 2.1: n-BuLI / tetrahydrofuran; hexane / 0.5 h / -78 °C 2.2: 88 percent / tetrahydrofuran; hexane / -78 °C 3.1: 90 percent / tetrabutylammonium fluoride (TBAF) / tetrahydrofuran / 1 h / 20 °C 4.1: 81 percent / MS 4 Angstroem / Zn(OTf)2 / toluene / 3 h / 90 °C View Scheme

1: 90 percent / tetrabutylammonium fluoride (TBAF) / tetrahydrofuran / 1 h / 20 °C 2: 81 percent / MS 4 Angstroem / Zn(OTf)2 / toluene / 3 h / 90 °C View Scheme

1.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / 0 °C 1.2: 76 percent / tetrahydrofuran; hexane / 0 °C 2.1: n-BuLi / tetrahydrofuran; hexane / -78 °C 2.2: 78 percent / tetrahydrofuran; hexane / -78 °C 3.1: n-BuLI / tetrahydrofuran; hexane / 0.5 h / -78 °C 3.2: 88 percent / tetrahydrofuran; hexane / -78 °C 4.1: 90 percent / tetrabutylammonium fluoride (TBAF) / tetrahydrofuran / 1 h / 20 °C 5.1: 81 percent / MS 4 Angstroem / Zn(OTf)2 / toluene / 3 h / 90 °C View Scheme

1.1: 73 percent / Br2 / acetic acid / 24 h / 20 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / 0 °C 2.2: 76 percent / tetrahydrofuran; hexane / 0 °C 3.1: n-BuLi / tetrahydrofuran; hexane / -78 °C 3.2: 78 percent / tetrahydrofuran; hexane / -78 °C 4.1: n-BuLI / tetrahydrofuran; hexane / 0.5 h / -78 °C 4.2: 88 percent / tetrahydrofuran; hexane / -78 °C 5.1: 90 percent / tetrabutylammonium fluoride (TBAF) / tetrahydrofuran / 1 h / 20 °C 6.1: 81 percent / MS 4 Angstroem / Zn(OTf)2 / toluene / 3 h / 90 °C View Scheme

1.1: n-BuLI / tetrahydrofuran; hexane / 0.5 h / -78 °C 1.2: 88 percent / tetrahydrofuran; hexane / -78 °C 2.1: 90 percent / tetrabutylammonium fluoride (TBAF) / tetrahydrofuran / 1 h / 20 °C 3.1: 81 percent / MS 4 Angstroem / Zn(OTf)2 / toluene / 3 h / 90 °C View Scheme

manganese(IV) oxide in various solvent(s) T=180°C; 120 h;