1: 91 percent / DDQ / benzene / 1 h / Heating 2: 97 percent / LiAlH4 / tetrahydrofuran / 24 h 3: 88 percent / BrSi(CH3)3 / CHCl3 / 50 deg C, 8 h; 20 deg C, 12 h View Scheme

2,3-dicyano-5,6-dichloro-p-benzoquinone in benzene 1 h; Heating;