1: 5-bromo-2,2-difluorobenzo[d][1,3]dioxole With magnesium in tetrahydrofuran T=20 - 60°C; 5 h; 2: chlorodiphenylphosphine oxide in tetrahydrofuran T=20°C; 21 h;

1: With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78 - 0°C; 2.75 h; 2: With iodine in tetrahydrofuran; hexane T=-78 - 20°C; 20 h;