Crystal structure of dimethyl 3H-naphtho[2,1,b]pyran-2,3-dicarboxylate, C17H14O5

Abstract

Source of materialDimethyl 3//-naphtho[2,1 ,i>]pyran-2,3-dicarboxylate was synthesized in accordance with published procedure [1][2][3]. The solution of title compound (0.4 g) in acetonitrile-benzene (1:1) (25 ml) left in room temperature for five days. The light yellow crystals were filtered off, washed with cold acetonitrile-benzene (1:1) (7 ml) and dried in vacuum over P4O10 (mp 407 K, yield 75%). Elemental analyses were consistent with the stiochiometry C17H14O5 (Found: C, 68.35%; H, 4.69%. Cale.: C, 68.45%; H, 4.73%). Melting points were measured on an Electrothermal 9100 apparatus and are uncorrected. Elemental analyses were performed using a Heraeus CHN-O-Rapid analyzer. DiscussionPyran derivatives are important heterocycles in bio-organic chemistry and are present in many natural products and pharmaceuticals [1][2][3][4][5][6][7][8]. There have been reported many studies on the synthesis of the heterocyclic pyran ring structure [1][2][3][4][5][6][7][8]. In the recent years there has been increasing interest in the determination of X-ray crystal structures of biologically active compounds [9][10][11][12][13][14][15][16][17][18][19], In the crystal structure of title compound, the covalent bonds are found to be almost the same as in the previous reports [10,15,16] (14)°, shows clearly that the carbonyl group (C14-02) and C=C double bond (C11-C12) share approximatly a common plane with S-trans conformation, probably is as a result of π-systems conjugations, π-π-rìng stacking is observed within the crystal structure, probably is as a result of the presence of parallel aromatic naphthalene rings which stabilize the crystal packing.

Crystal structure of diaqua-bis[N-(2-pyridyl)carbonylaniline]copper(II) dinitrate, Cu(C12H16N2O)2(H2O)2(NO3)2

“…Some of these complexes serve as structural models for the active site in enzymes [2]. In the recent years the interest in the determination of X-ray crystal structures of biologically active compounds increased [3]. In this work, we describe the crystal structure of diaqua-bis[N- (2- 2 .…”

Crystal structure of methyl 3-oxo-3H-benzo[f]chromene-1-carboxylate, C15H10O4

“…There have been reported many studies on the synthesis of the heterocyclic chromene ring structure [2][3][4][5][6][7][8]. In the recent years there has been increasing interest in the determination of X-ray crystal structures of biologically active compounds [9,10].…”