1: 87 percent / p-toluenesulfonic acid 2: 93 percent / pyridine 3: 72 percent / SeO2 / acetic acid 4: 19 percent / silver carbonate, silver oxide, silver perchlorate / CH2Cl2 / in dark 5: methanolic sodium methoxide View Scheme

1: 93 percent / pyridine 2: 72 percent / SeO2 / acetic acid 3: 19 percent / silver carbonate, silver oxide, silver perchlorate / CH2Cl2 / in dark 4: methanolic sodium methoxide View Scheme

1: 19 percent / silver carbonate, silver oxide, silver perchlorate / CH2Cl2 / in dark 2: methanolic sodium methoxide View Scheme

1: 72 percent / SeO2 / acetic acid 2: 19 percent / silver carbonate, silver oxide, silver perchlorate / CH2Cl2 / in dark 3: methanolic sodium methoxide View Scheme

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