lithium hydride in N,N-dimethyl-formamide Ambient temperaturethe mixture stirred until homogeneous;

1: acetone / 0.08 h / 40 °C 2: 85 percent / acetone / 0.5 h / 20 °C 3: 68 percent / Lithium hydride / dimethylformamide / Ambient temperature; the mixture stirred until homogeneous View Scheme

1: 85 percent / acetone / 0.5 h / 20 °C 2: 68 percent / Lithium hydride / dimethylformamide / Ambient temperature; the mixture stirred until homogeneous View Scheme