The asymmetric unit of the title compound, C(11)H(12)N(2)O, contains two independent mol-ecules. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules. There are π-π contacts between the quinoxaline rings [centroid-centroid distances = 3.446 (2), 3.665 (2), 3.645 (3) and 3.815 (3) Å]. There also exist C-H⋯π contacts between the methyl groups and the quinoxaline rings.

The title compound, C(17)H(14)N(2)O, crystallizes with two mol-ecules in the asymmetric unit. The dihedral angles between the mean planes of the quinoxaline ring system and the phenyl ring in the two mol-ecules are 38.27 (10) and 37.14 (8)°. In the crystal, π-stacking along the b axis contributes to the crystal cohesion with an average distance between quinoxaline units of 3.397 (3) Å. Weak C-H...

The asymmetric unit of the title compound, C(16)H(14)N(2)O, contains three independent mol-ecules. The dihedral angles between the quinoxaline and phenyl planes in the three mol-ecules are 82.58 (8), 85.66 (9) and 85.36 (9)°. The crystal packing is stabilized by C-H⋯O and C-H⋯N hydrogen bonds.

In the crystal structure of the title compound, C(11)H(11)NO(4), intra-molecular O-H⋯O hydrogen bonding results in the formation of a planar five-membered ring, which is nearly coplanar with the quinoline group. Inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers.

2-(2-Alkoxycarbonyl-1-arylamino-1-propenyl)benzimidazolium and 5-(2-alkoxycarbonyl-1-arylamino-1-propenyl)triazolium salts were synthesized in good yields from the reaction of benzimidazole and triazole carbenes with ketenimines. Upon treatment with a base, both salts were converted into novel 1,3-dipoles which underwent [3+2] cycloaddition reactions with electron-deficient alkynes and allenes ...

This work reports on a novel fluorescent sensor 1 for Cd2+ ion based on the fluorophore of tetramethyl substituted bis(difluoroboron)-1,2-bis[(1H-pyrrol-2-yl)methylene]hydrazine (Me₄BOPHY), which is modified with an electron donor moiety of N,N-bis(pyridin-2-ylmethyl)benzenamine. Sensor 1 has absorption and emission in visible region, at 550 nm and 675 nm, respectively. The long wavelength spec...