potassium carbonate in methanol T=20°C; 24 h;

bis(cyclopentadienyl)titanium dichloride; manganese; Coll*HCl in tetrahydrofuran 0.75 h; RefluxInert atmosphere;

T=155 - 160°C;

T=220 - 225°C; 30 h;

T=220 - 225°C; 30 h;

1: p-methylbenzenesulfonyl (tosylate); sodium hydride / tetrahydrofuran; mineral oil / 0 - 20 °C 2: manganese; bis(cyclopentadienyl)titanium dichloride / tetrahydrofuran / 0.75 h / Reflux; Inert atmosphere View Scheme

1: osmium(VIII) oxide; 4-methylmorpholine N-oxide / tetrahydrofuran; acetone; toluene / pH 7 / aq. phosphate buffer 2: p-methylbenzenesulfonyl (tosylate); sodium hydride / tetrahydrofuran; mineral oil / 0 - 20 °C 3: manganese; bis(cyclopentadienyl)titanium dichloride / tetrahydrofuran / 0.75 h / Reflux; Inert atmosphere View Scheme

1: tetra-(n-butyl)ammonium iodide; potassium carbonate / acetonitrile / Reflux 2: osmium(VIII) oxide; 4-methylmorpholine N-oxide / tetrahydrofuran; acetone; toluene / pH 7 / aq. phosphate buffer 3: p-methylbenzenesulfonyl (tosylate); sodium hydride / tetrahydrofuran; mineral oil / 0 - 20 °C 4: manganese; bis(cyclopentadienyl)titanium dichloride / tetrahydrofuran / 0.75 h / Reflux; Inert atmosphere View Scheme

T=260 - 265°C; 2.5 h; Further byproducts.;

1: KOH 2: 53.1 percent / 30 h / 220 - 225 °C View Scheme