isourea dilithium salt in tetrahydrofuran T=-78°C;

1.1: 90 percent / isourea dilithium salt / tetrahydrofuran / -78 °C 2.1: isourea dilithium salt / hexane; tetrahydrofuran / 0.5 h / -78 °C 2.2: 76 percent / hexane; tetrahydrofuran / 12 h View Scheme