toluene-4-sulfonic acid in benzene 22 h; Heating;

potassium tert-butylate in ethanol 4 h; Heating;

potassium tert-butylate in tert-butyl alcohol 24 h; Ambient temperature;

1: 88 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / CH2Cl2 / 5 h / Heating 2: neat (no solvent) / pyrolysis 3: 75.4 percent / toluene-p-sulphonic acid monohydrate / 24 h / Heating 4: water / stannic chloride / CH2Cl2 5: 97 percent / triethylamine / 1 h 6: stannic chloride View Scheme

1: water / stannic chloride / CH2Cl2 2: 95 percent / sodium hydride / dimethylformamide 3: 88 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / CH2Cl2 / 5 h / Heating 4: neat (no solvent) / pyrolysis 5: 75.4 percent / toluene-p-sulphonic acid monohydrate / 24 h / Heating 6: water / stannic chloride / CH2Cl2 7: 97 percent / triethylamine / 1 h 8: stannic chloride View Scheme

1: neat (no solvent) / pyrolysis 2: 75.4 percent / toluene-p-sulphonic acid monohydrate / 24 h / Heating 3: water / stannic chloride / CH2Cl2 4: 97 percent / triethylamine / 1 h 5: stannic chloride View Scheme

1: 95 percent / sodium hydride / dimethylformamide 2: 88 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / CH2Cl2 / 5 h / Heating 3: neat (no solvent) / pyrolysis 4: 75.4 percent / toluene-p-sulphonic acid monohydrate / 24 h / Heating 5: water / stannic chloride / CH2Cl2 6: 97 percent / triethylamine / 1 h 7: stannic chloride View Scheme

1: 75.4 percent / toluene-p-sulphonic acid monohydrate / 24 h / Heating 2: water / stannic chloride / CH2Cl2 3: 97 percent / triethylamine / 1 h 4: stannic chloride View Scheme

1: 76 percent / 1 M tetrabutylammonium fluoride / tetrahydrofuran / 0 °C 2: silver tetrafluoroborate 3: 75.4 percent / toluene-p-sulphonic acid monohydrate / 24 h / Heating 4: water / stannic chloride / CH2Cl2 5: 97 percent / triethylamine / 1 h 6: stannic chloride View Scheme

1: water / stannic chloride / CH2Cl2 2: 97 percent / triethylamine / 1 h 3: stannic chloride View Scheme