Crystal structures of two 2,3-di-ethyl-naphtho-[2,3-g]quinoxaline-6,11-dione derivatives.

ABSTRACT: Two new 5,12-disubstituted 2,3-di-ethyl-naphtho-[2,3-g]quinoxaline-6,11-dione compounds were readily synthesized from the commercial dye quinizarin. For 2,3-diethyl-5,12-di-hydroxy-naphtho-[2,3-g]quinoxaline-6,11-dione, (II), C₂₀H₁₆N₂O₄, the mol-ecule displays a near planar conformation and both hy-droxy groups participate in intra-molecular O-H⋯O(carbon-yl) hydrogen bonds. In the crystal, π-π ring inter-actions [minimum ring centroid separation = 3.5493 (9) Å] form stacks of co-planar mol-ecules down the c axis, while only minor inter-molecular C-H⋯O inter-actions are present. In contrast, in 2,3-diethyl-5,12-bis-(piperidin-1-yl)naphtho-[2,3-g]quinoxaline-6,11-dione, (IV), C₃₀H₃₄N₄O

SUBMITTER: Forsyth CM 

PROVIDER: S-EPMC5598832 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature