All NMR spectra were measured with an Oxford Varian 300 and 500 MHz spectrometers. Solvents peaks were used as an internal standard for the 1 H NMR (300 MHz) and C{ 1 H} NMR (125 MHz) spectra. The melting point was determined in a capillary sealed under N2 with a Stuart ® SMP10 melting point apparatus and is uncorrected. GaCl3 (99.99%) was purchased from ACROS-Organics TM and lithium dimethylamide (95%) from Sigma-Aldrich™, and both were used without further purification.