AlCl 3 (0.629 g, 4.72 mmol) and Me 4 NCl (0.580 g, 5.29 mmol) powders were loaded together into a Schlenk vessel in drybox and sealed. The vessel was evacuated, cooled by liquid nitrogen and THF (~10 cm 3 ) was vapor transferred onto the solids. The vessel was then allowed to warm up to room temperature to facilitate controlled reaction. The resultant hazy suspension was filtered through a Schlenk frit and all volatiles were removed under dynamic vacuum at 60 °C to afford the product (1.125 g, 98.2 %) as a white powder.