available N-tert-butyltrimethylsilylamine (BTA) was transferred to a pear-shaped flask, degassed in vacuo, and stored neat under argon. Potassium cubes in mineral oil (3.9 g, 99 mmol, 1.25 equiv) were added to a 250 mL round-bottom flask under argon. (The flask should be attached to a Schlenk line via a fine swivel frit for those interested in completing a purification.) The potassium was rinsed three times with 10 mL of distilled and dry hexanes to remove the mineral oil. The third and final hexane suspension was heated via a heat gun to melt the potassium while stirring vigorously with a magnetic stir bar. Cooling to ambient temperature while stirring vigorously produced a suspension of small potassium pellets, which was allowed to settle and the hexane removed by syringe. The remaining pellets were dried in vacuo and placed under argon. To the dried potassium pellets was added Et3N (50 mL) and BTA (15 mL, 79 mmol, 1.0 equiv). Isoprene (4.0 mL, 40 mmol, 0.50 equiv) freshly distilled from 4 Å molecular sieves in 6.0 mL Et3N was injected via a syringe pump at a rate of 0.10 mL/min with vigorous stirring.