1: 57 percent / POCl3 / CH2Cl2 / 8 h / Ambient temperature 2: 78 percent / triethylamine / benzene / 30 h / Heating 3: 78.7 percent / 2,3-dichloro-5,6-dicyanobenzoquinone, acetic acid / benzene / 1.) 1 h, ice-bath, 2.) 3 h, room temperature 4: Zn View Scheme

1: 78 percent / triethylamine / benzene / 30 h / Heating 2: 78.7 percent / 2,3-dichloro-5,6-dicyanobenzoquinone, acetic acid / benzene / 1.) 1 h, ice-bath, 2.) 3 h, room temperature 3: Zn View Scheme

1: 78.7 percent / 2,3-dichloro-5,6-dicyanobenzoquinone, acetic acid / benzene / 1.) 1 h, ice-bath, 2.) 3 h, room temperature 2: Zn View Scheme

2: 57 percent / POCl3 / CH2Cl2 / 8 h / Ambient temperature 3: 78 percent / triethylamine / benzene / 30 h / Heating 4: 78.7 percent / 2,3-dichloro-5,6-dicyanobenzoquinone, acetic acid / benzene / 1.) 1 h, ice-bath, 2.) 3 h, room temperature 5: Zn View Scheme

1: 33.3 percent / γ-manganese dioxide / CCl4 / 4 h / Ambient temperature 2: Zn View Scheme

diethyl ether; zinc; benzene

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