STRUCTURE OF A LACTONE, (3-ALPHA,4-ALPHA,6-ALPHA)-4-(TERT-BUTYLDIMETHYLSILOXY)-3,4,5,6-TETRAHYDRO-6-METHYL-3-(2-OXOPROPYL)-2H-PYRAN-2-ONE

C15H28O4Si, M(r) = 300.5, monoclinic, P2(1)/a, a = 11.194 (4), b = 10.944 (3), c = 14.815 (5) angstrom, beta = 95.01 (3)-degrees, V = 1808 (2) angstrom 3, D(x) = 1.104 g cm-3, Z = 4, lambda(Mo K-alpha) = 0.71069 angstrom, mu = 1.43 cm-1, F(000) = 656, T = 293 K, final R = 0.052, wR = 0.058 for 1630 reflections with I > 3-sigma(I). The valerolactone ring is in a boat conformation and the three ring substituents are cis.