反应条件
1: With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-20 - 0°C; 0.0833333 h; 2: 2,4-difluoro-1-bromobenzene in tetrahydrofuran; hexane T=-78 - -65°C; 2 h; 3: With 1,1,1,3,3,3-hexachloro-propan-2-one in tetrahydrofuran; hexane T=-65 - 20°C;