N′-(2-Hydroxybenzoyl)-2-oxo-2H-chromene-3-carbohydrazide

Abstract

Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.002 Å R factor = 0.040 wR factor = 0.120 Data-to-parameter ratio = 14.5For details of how these key indicators were automatically derived from the article, see A packing diagram for the title compound. Dashed lines represent hydrogen bonds.

Crystal structure of (E)-N'-((7-(diethylamino)-2-oxo-2H-chromen- 3-yl)methylene)-2-hydroxybenzohydrazide, C21H21N3O4

“…In the title crystal structure, the coumarin group (C1-C9/O1/O2) is nearly planar. The dihedral angle between the benzene ring and the fused pyrone ring is 1.59(3)°,w hich is in agreement with those found in analogous coumarin derivatives [3,4]. The dihedral angle between the 2-hydroxybenzohydrazide group and the coumarin unit is 46.00(2) Å.T he N2-N3 bond length of 1.388(2) Å is comparable to the hydrazone analogues [5].…”

Crystal structure of 1-(2-hydroxy-8-methoxy-2-methyl-2H-chromene- 3-yl)ethanone, C13H14O4

“…Some of their derivatives have been shown photochromic properties [3]. There are some new reports on the crystal structures of 2H-chromene derivatives [4][5]. Although the title compound is ac yclic hemiacetal and could be converted to benzylidine compound [6], it can be stored for along time without any changes.…”