Structure of ethyl 4-methyl-2-oxo-3-phenyl-2,3-dihydro-5-benzofurancarboxylate
Abstract
<h2>Acta Crystallographica Section C</h2><h3>Crystal Structure Communications</h3><h3>0108-2701</h3> <h2>research papers (organic compounds)</h2> Volume 45 Part 11 Pages 1736-1738 November 1989 <h2>Structure of ethyl 4-methyl-2-oxo-3-phenyl-2,3-dihydro-5-benzofurancarboxylate</h2> R. Ghosh, P. Roychowdhury and P. Maulik Acta Cryst. (1989). C45, 1736-1738 Structure of Ethyl 4-Methyl-2-oxo-3-phenyl-2,3-dihydro-5-benzofurancarboxylate BY R. GHOSH AND P. ROYCHOWDHURY* Department of Physics (X-ray Laboratory), University College of Science, 92 Acharys Prafulla Chandra Road, Calcutta-700 009, India AND P. MAULIK Biophysics Division, Department of Medicine, Boston Univeristy School of Medicine, Boston, MA 02118, USA (Received 13 February 1989; accepted 29 March 1989) Abstract. C18H1604, Mr = 296.322, monoclinic, C2/c, a=22-92(3), b=8.06(2), c= 22-72 (2) /~, r= 133.24 (3)°, V= 3057.61 (3) A3, Z = 8, Dm= 1"30, Dx = 1.29 g cm-3, A(Mo Kot) = 0-7135 A, /z = 0.85 cm-1, F(000) = 1248-0, T = 298 (1) K, final R = 0.067 for 1536 observed reflections. The structure has two phenyl rings (I,III), one of which (III) is fused to the furan ring (II). Ring I is perpendicular to III and nearly perpendicular to II, which is in a twist confor- mation. The C(5)---C(9) single bond is shortened [1.491 (10) A] owing to the adjacent double bonds. Introduction. The crystal and molecular structure