Conformational enanti­omeric disorder in tripivaloylmethane

Tripivaloylmethane [systematic name: 4-(2,2-dimethyl­propano­yl)-2,2,6,6-tetra­methyl­heptane-3,5-dione], C₁₆H₂₈O₃, is a 1,3,3′-triketone with C₃ mol­ecular symmetry, prepared by α-acyl­ation of 2,2,6,6-tetra­methyl­heptane-3,5-dione with 2,2-dimethyl­propanoyl anhydride in the presence of barium metal. The mol­ecules are conformationally chiral and pack so that each mol­ecular site is occupied with equal probability by the two enantiomers. The carbonyl groups of the two superimposed enantiomeric mol­ecules are at an angle of 75.4 (16)°.