2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in various solvent(s) T=80°C; kC/kH for cyclization of the corresponding radical (3), activation barrier; var. temp.; KineticsThermodynamic data;

lithium bromide in tetrahydrofuran 36 h; Heating;

1: 88 percent / H2 / Raney nickel / ethanol / 48 h / 100 °C / 76000 Torr 2: 92 percent / Na2Cr2O7, H2SO4 / diethyl ether; H2O / 3 h 3: 1) NaH / 1) DMSO, 2 h, 80 deg C, 2) DMSO, 2 h, 50 deg C 4: 92 percent / LiAlH4 / diethyl ether / 2 h / Heating 5: 95 percent / pyridine / 24 h / Ambient temperature 6: 72 percent / LiBr / tetrahydrofuran / 36 h / Heating View Scheme

1: 95 percent / pyridine / 24 h / Ambient temperature 2: 72 percent / LiBr / tetrahydrofuran / 36 h / Heating View Scheme

1: LiAlH4 / tetrahydrofuran / 4 h / Heating 2: pyridine / 18 h 3: NaBr, HMPA / acetone / 6 h / Heating View Scheme

1: 92 percent / Na2Cr2O7, H2SO4 / diethyl ether; H2O / 3 h 2: 1) NaH / 1) DMSO, 2 h, 80 deg C, 2) DMSO, 2 h, 50 deg C 3: 92 percent / LiAlH4 / diethyl ether / 2 h / Heating 4: 95 percent / pyridine / 24 h / Ambient temperature 5: 72 percent / LiBr / tetrahydrofuran / 36 h / Heating View Scheme

1: 1) NaH / 1) DMSO, 2 h, 80 deg C, 2) DMSO, 2 h, 50 deg C 2: 92 percent / LiAlH4 / diethyl ether / 2 h / Heating 3: 95 percent / pyridine / 24 h / Ambient temperature 4: 72 percent / LiBr / tetrahydrofuran / 36 h / Heating View Scheme

1: 92 percent / LiAlH4 / diethyl ether / 2 h / Heating 2: 95 percent / pyridine / 24 h / Ambient temperature 3: 72 percent / LiBr / tetrahydrofuran / 36 h / Heating View Scheme

tri-n-butyl-tin hydride 1 h; Irradiation;

2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in various solvent(s) T=80°C; kC/kH for cyclization of the corresponding radical (3), activation barrier; var. temp.; KineticsThermodynamic data;