Obtained as a sublimate by heating cupric acetate in vacuo to temps above 220°: Angel, Harcourt, J. Chem. Soc. 81, 1385 (1902); prepn from cuprous oxide and acetic acid-acetic anhydride: Shimizu, Weller, J. Am. Chem. Soc. 74, 4469 (1952). Crystal structure: T. Ogura et al., J. Am. Chem. Soc. 95, 949 (1973).