triethylsilane; trifluoroacetic acid in dichloromethane T=5°C; 2 h;

lithium in tetrahydrofuran; tert-butyl alcohol 24 h; Ambient temperature;

lithium in tetrahydrofuran; tert-butyl alcohol 24 h; Ambient temperature;

sulfuric acid in 2-methyl cyclohexane 0.5 h; Ambient temperature;

1: tert-butyllithium / 1.) pentane, ether, -78 deg C, 2 h, 2.) ether, pentane, a) -78 deg C, 2 h, b) 0 deg C, 1 h, c) 12 h, room temp. 2: 65 percent / 0.1 M perchloric acid / acetone; H2O / 20 h / Heating 3: 48 percent / sulfuric acid / methylcyclohexane / 0.5 h / Ambient temperature View Scheme

1: 87 percent / sodium iodide, 95percent phosphoric acid / 24 h / 110 °C 2: tert-butyllithium / 1.) pentane, ether, -78 deg C, 2 h, 2.) ether, pentane, a) -78 deg C, 2 h, b) 0 deg C, 1 h, c) 12 h, room temp. 3: 65 percent / 0.1 M perchloric acid / acetone; H2O / 20 h / Heating 4: 48 percent / sulfuric acid / methylcyclohexane / 0.5 h / Ambient temperature View Scheme

1: 0.67 M aq. hydrochloric acid, N,N-dimethylformamide / 20 h / Heating 2: 48 percent / sulfuric acid / methylcyclohexane / 0.5 h / Ambient temperature View Scheme

in various solvent(s) T=250°C;

2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in benzene 2 h; Heating;

2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in benzene 2 h; Heating;