in THF-d8 (tetrahydrofuran-d8) byproducts: propane; Sonication; 1 M MeLi (2 equiv.) mixed with CuIPBu3 (1 equiv.) (-78°C); sonicated (0°C, 0.1 h); 0.5 M EtI (1 equiv.) injected (spinning, -100°C); heated above -80°C;