1: 93.6 percent / N-bromosuccinimide, dibenzoylperoxide, α,α'-azoisobutyronitrile / CCl4 / 3 h / Heating; Irradiation 2: 65.4 percent / sodium, ethanol, 2-nitropropane / dimethylformamide / 2 h / 60 - 65 °C View Scheme