1.1: methanol; potassium carbonate / 20 h / 20 °C 2.1: PCC-alumina / hexane / 20 °C 3.1: magnesium / tetrahydrofuran 3.2: 0.5 h / 0 °C 3.3: 1.58 h / -78 °C 4.1: ethylaluminum dichloride / hexane; 1,2-dichloro-ethane / 1.5 h / 20 - 55 °C View Scheme

1.1: methanol; potassium carbonate / 20 h / 20 °C 2.1: PCC-alumina / hexane / 20 °C 3.1: copper(l) iodide / tetrahydrofuran; hexane / 0.25 h / -5 °C 3.2: 2 h / -78 °C 4.1: ethylaluminum dichloride / hexane; 1,2-dichloro-ethane / 1.5 h / 55 °C View Scheme

1.1: methanol; potassium carbonate / 20 h / 20 °C 2.1: PCC-alumina / hexane / 20 °C 3.1: magnesium / tetrahydrofuran 3.2: 0.5 h / 0 °C 3.3: 1.58 h / -78 °C 4.1: ethylaluminum dichloride / hexane; 1,2-dichloro-ethane / 1.5 h / 55 °C View Scheme

1.1: methanol; potassium carbonate / 20 h / 20 °C 2.1: PCC-alumina / hexane / 20 °C 3.1: magnesium / tetrahydrofuran 3.2: 0.5 h / 0 °C 3.3: 1.58 h / -78 °C 4.1: ethylaluminum dichloride / hexane; 1,2-dichloro-ethane / 1.5 h / 55 °C View Scheme

1: 91 percent / KOH / methanol / 24 h 2: 81 percent / PBr3, pyridine / diethyl ether / 1) -25 to -20 deg C, 3 h, 2) 18 deg C, 12 h 3: 85 percent / methanol / 1) 5 - 10 deg C, 0.5 h, 2) room temperature, 2 h View Scheme

1.1: methanol; potassium carbonate / 20 h / 20 °C 2.1: PCC-alumina / hexane / 20 °C 3.1: copper(l) iodide / tetrahydrofuran; hexane / 0.25 h / -5 °C 3.2: 2 h / -78 °C 4.1: ethylaluminum dichloride / hexane; 1,2-dichloro-ethane / 1.5 h / 55 °C View Scheme