CRYSTAL STUDIES OF MUSK COMPOUNDS .4. STRUCTURE OF 4-ACETYL-6-TERT-BUTYL-1,1-DIMETHYLINDAN (MUSK CELESTOLIDE)

C17H24O, M(r) = 244.38, triclinic, P1BAR, a = 10.160 (2), b = 12.230 (2), c = 12.796 (1) angstrom, alpha = 105.735 (6), beta = 99.58 (2), gamma = 90.09 (1)-degrees, V = 1507.2 (5) angstrom 3, Z = 4, D(x) = 1.08 Mg m-3, lambda(Cu K-alpha) = 1.5418 angstrom, mu = 0.461 mm-1, F(000) = 536, T = 240 K, final R = 0.046 for 4766 observed reflections. There are two independent molecules in the asymmetric unit, related to each other by a non-crystallographic twofold screw axis. The aromatic ring is essentially planar, whereas the five-membered ring is an almost ideal C(2) envelope. The torsion angle C(9)-C(4)-C(12)-O(1) has an average value of 23-degrees. The geometries of the independent molecules are compared.