2,3-dicyano-5,6-dichloro-p-benzoquinone in dichloromethane T=-5 - 20°C;

1: 2,3-Difluoro-phenol With magnesium methanolate in toluene 0.666667 h; Reflux; 2: formaldehyd in toluene T=115°C; 0.783333 h; 3: With hydrogenchloride; water in toluene T=20°C;