1.1: 76 percent / LiTMP / tetrahydrofuran; hexane / 0.33 h / -78 °C 2.1: LiHMDS / tetrahydrofuran; hexane / 0.33 h / -78 °C 2.2: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C 2.3: 92 percent / tetrahydrofuran; hexane / -78 - 0 °C View Scheme