Crystal and molecular structure of 2,5-dimethyl-3,4-diacetylfuran

The crystal and molecular structure of 2,5-dimethyl-3,4-diacetylfuran has been determined by direct methods using Cu Kα. photographic data. Refinement by full-matrix least-squares methods gave a final R factor of 0·097. The crystals are monoclinic: space group P2₁/c, a =14·92(2), b = 4·09(1), c =16·68(3) Å and β = 109·7(5) °;Z = 4. The furan ring of the molecule is planar, and the exocyclic atoms bound to the atoms of the ring lie close to the ring plane. The planes of the acetyl groups are tilted by 16 ° and 47 ° with respect to the ring plane. The exocyclic bond angles of this compound are significantly different from the equivalent angles in furan.