1. Trotter, J.; Darby, W. InOrganic Syntheses; Wiley: New York, 1955; Collect. Vol. III, p 460. We have optimized the workup and isolation conditions of this original report by replacing the use of hydrogen sulfide to decompose the copper salts with thioacetimide and isolating the final product1by chromatography instead of precipitation as a perchlorate salt. Preparations of1on a 0.5 mmol scale have been routinely carried out using these modifications. Details can be found in Supporting Information.