1-(2-Eth­oxy-2-methyl-2H-chromen-3-yl)ethanone

The Csp 3 atom of the chromenyl fused-ring system in the title compound, C14H16O3, deviates by 0.407 (2) Å from the plane of the other atoms (r.m.s. deviation = 0.041 Å). The eth­oxy substituent occupies a pseudo-axial position

(E)-3-Hy­droxy-5,5-dimethyl-2-(3-phenyl­prop-2-en-1-yl)cyclo­hex-2-en-1-one

Five of the atoms of the six-membered cyclo­hexene ring of the title compound, C17H20O2, are essentially coplanar (r.m.s. deviation = 0.006 Å), with the sixth (the dimethyl­methyl C atom) deviating from the mean plane of the five atoms by 0.610 (2) Å. This plane is nearly perpendicular to the cinnamyl portion, the two planes being aligned at 85.1 (1)°. Two mol­ecules are linked by an O—H⋯O hydrogen bond about a center of inversion. The cyclo­hexene ring is disordered over two directly overlapping positions. As a result, the hy­droxy group and the keto O atom cannot be distinguished from one another

(E)-2-Bromo­benzaldehyde oxime

The configuration of the C=N double bond of the title compound, C7H6BrNO, is E; the non-H atoms are approximately coplanar (r.m.s. deviation = 0.038 Å). In the crystal, pairs of mol­ecules are linked by a pair of O—H⋯N hydrogen bonds about a center of inversion, generating hydrogen-bonded dimers

4-(5-Bromo-2-hydroxy­phen­yl)but-3-ene-2-one

The molecule of the title compound, C10H9BrO2, a doubly conjugated unsaturated ketone, is almost planar (r.m.s. deviation of the non-H atoms = 0.039 Å). In the crystal structure, two mol­ecules are linked across a centre of inversion to form a hydrogen-bonded dimer by way of two O—H⋯O links

(5E)-Dimethyl 2-bromo­methyl-5-cyclo­hexyl­imino-2-phenyl-2,5-dihydro­furan-3,4-dicarboxyl­ate

The mol­ecule of the title compound, C21H24BrNO5, has a planar furan ring [maximum deviation = 0.025 (3) Å]. The carboxy­methyl group in the 3-position is nearly coplanar with this ring [dihedral angle = 7.9 (1)°], whereas that in the 4-position is nearly perpendicular to it [dihedral angle = 78.9 (1) Å]

Trimethyl 4,6-Dicyano-5-hydroxybenzene-1,2,3-tricarboxylate

A novel synthesis of a fully substituted fluorescent phenol by a one-pot reaction of dimethyl acetylendicarboxylate and malononitrile in the presence of catalysts has been developed. The structure of the synthesized compound was assigned on the basis of its elemental analysis, 1H-NMR, 13C-NMR, IR, mass spectral and X-ray data. The photophysical data of the new compound are reported

Trimethyl 4,6-Dicyano-5-hydroxybenzene-1,2,3-tricarboxylate

A novel synthesis of a fully substituted fluorescent phenol by a one-pot reaction of dimethyl acetylendicarboxylate and malononitrile in the presence of catalysts has been developed. The structure of the synthesized compound was assigned on the basis of its elemental analysis, 1H-NMR, 13C-NMR, IR, mass spectral and X-ray data. The photophysical data of the new compound are reported. © 2012 by the authors; licensee MDPI, Basel, Switzerland

Novel Synthesis of Some New Fluorescent 2-Amino-3-cyanopyridines

Novel synthesis of some new fluorescent 2-amino-3-cyanopyridines 2a-m in the presence of N-hydroxybenzamide or p-toluenesulfonic acid is described. Photophysical data including λ Abs. and λ Flu. of 2a-m in CH 2Cl 2, MeCN and MeOH have been measured. © 2012 The Japan Institute of Heterocyclic Chemistry

Novel Approaches for the Synthesis of a Library of Fluorescent Chromenopyrimidine Derivatives

A library of some new fluorescent chromenopyrimidine derivatives has been synthesized by new approaches. Water-promoted and one-pot reaction can produce new dialkylylamino)-5H-chromeno[2,3-d]pyrimidin-2-yl) phenols. These compounds can also be produced using domino reaction. Two parallel methods are compared. Novel N-alkyl-N-phenyl-5H-chromeno[2,3-d]-pyrimidin-4-amines and 4-alkoxy-5H-chromeno[2, 3-d]pyrimidines are synthesized by Lewis-acid catalyzed reactions. The fluorescence emission intensity of the four compounds from each of libraries after excitation in 290 nm is measured. Compound 2-(4,5-bis(N-methyl-N-phenylamino)-5H-chromeno[2,3-d]pyrimidin-2-yl)phenol was isolated as a byproduct. The details of an interesting exchangeable intramolecular H- bonding of two of the new compounds are reported by X-ray analysis data. © 2013 American Chemical Society