Potassium ZerZ.-butoxide, solution

A chilled (—35°C) solution of commercial potassium ZerZ-butoxide (1.95 g, 17.4 mmol) in 20 mL THF is added to a suspension of anhydrous copper(I) iodide (3.00 g, 15.79 mmol) in 25 mL of THF. The mixture is stirred overnight at room temperature. The resulting solution is then filtered through Celite to remove the precipitated KI followed by removal of all volatiles from the filtrate in vacuo to give a brown-yellow residue. Addition of ca. 5 mL of cold pentane allows the isolation of a pale yellow solid from this residue by filtration and dried in vacuo to afford 1.69 g (78%) of pale yellow copper(I) ZerZ-butoxide. 

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