An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Depending on the conditions and the order of addition of the reactants, reactions of N-sulfonyl-1,4-benzoquinone imines with sodium azide afforded N-(3-azido-4-hydroxyphenyl)alkane(arene)sulfonamides, N-(3-azido-4-oxocyclohexa-2,5-dienylidene)alkane(arene)sulfonamides, and N-(3,5-diazido-4-hydroxyphenyl)-alkanesulfonamides. Quantum chemical calculations showed that the reactions begin with addition of azide ion to the quinone imine.

The limitations of author's modification of the well-known method for determination of water content in organic solvents with chloranilic acid (CAA) [Anal. Chim. Acta 16 (1962) 494] are illustrated. An insight into the CAA solvatochromism at the molecular level is proposed on the basis of quantum-chemical calculations. The bathochromic shift is explained by CAA anion formation in an interaction with the solvent. Deprotonation of CAA depends substantially on the solvent, both on the first solvation shell microstructure and on the bulk solvent phase. The deprotonation equilibrium, responsible for the long-wavelength absorption, limits applicability of the analytical method.

Radical anion 1,6-addition path in the reactions of N , N ′-disubstituted 1,4-benzoquinone diimines with sodium arenesulfinates is favored by increase of the electron-donating power of the substituent in the para position of arenesulfinate ion and redox potential of the initial 1,4-benzoquinone diimine.

-Aryl-1,4-benzoquinone imines reacted with sodium arenesulfinates to give products of orbital-controlled nucleophilic 1,4- and 6,3-addition.

N -[arylsulfonylimino(methyl)methyl] derivatives of 1,4-benzoquinone monoimine with alkyl substituents in the quinoid ring have been synthesized and their spectral characteristics were determined. The thiocyanation of N -aryl, N -acetyl, and N -[arylsulfonylimino(methyl)methyl] derivatives of 1,4-benzoquinone monoimine depending on the LUMO energy of the initial quinone monoamine affords derivatives of benzo[ d ][1,3]oxathiol-2-ones and benzo[ d ]oxazole-2(3 H )-thiones.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

The reaction of N -arenesulfonyl- N ′-aroyl-1,4-benzoquinone diimines with potassium thiocyanate in glacial acetic acid occurs as 1,4-addition of thiocyanate ion by the sulfur atom to the quinoid ring in the meta position with respect to the aroyl group. The addition products, N -[4-(arenesulfonamido)-3-thiocyanatophenyl]-benzamides, partially undergo intramolecular cyclization to N -(2-imino-3-arenesulfonyl-2,3-dihydro-1,3-benzothiazol-6-yl)benzamides whose hydrolysis yields 2-amino-6-benzamido-1,3-benzothiazol-3-ium arenesulfonates. The latter lose arenesulfonic acid with formation of N -(2-amino-1,3-benzothiazol-6-yl)benzamides on treatment with a mixture of methanol with water and acetic acid.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Steric strain in the C=N-C fragment in 3,5-disubstituted N-acyl-1,4-benzoquinone monoimines, unlike their N-arylsulfonyl analogs, leads to increase of the C=N-C angle above 130° or twisting of the double C=N bond and loss of planarity of the quinoid ring. This structural transformation enhances the reactivity of the C=N bond so that 1,2-addition of alcohols becomes possible with formation of sterically unstrained cyclohexadienone structure with sp 3-hybridized C4 carbon atom.

The reactions of 2-(2-hetaryl)-2-(tetrahydrofuran-2-ylidene)acetonitriles with conformationally rigid and heterocyclic tertiary amines were investigated. Compounds with bipolar structures were obtained: 1-cyano-1-(2-hetaryl)-5-(pyridinium-1-yl)-1-penten-2-olates and 5-(4-aza-1-azoniobicyclo[2.2.2]oct-1-yl)-1-cyano-1-(2-hetaryl)pent-1-en-2-olates.

Steric strains arising between the substituent atoms at nitrogen (S, SO, or SO2) and the methyl group located in positions 3 or 5 of the quinoid ring of 3,5-dimethyl-substituted quinone monoimines lead to the increased angle C=N-S. As a result in these quinone monoimines the reactions of 1,2-addition become thermodynamically possible since the formation of quinolide structures with the sp3-hybridized carbon atom removes the steric strain.

New N -aryl(phenoxy, benzylidene)acetyl-1,4-benzoquinone monoimines were synthesized by reaction of aminophenols with arylacetyl, phenoxyacetyl, and cinnamoyl chlorides in dimethylformamide-acetic acid (1: 3) in the presence of anhydrous sodium acetate. Structural parameters of the products and their probable biological activity were determined.

A series of previously unknown 2-([1]benzothieno[2,3-c]pyridin-1-yl)benzoic acids and 8,13b-dihydro-[1]benzothieno[2',3':3,4]pyrido[2,1-a]isoindol-5(7 H)-ones has been synthesized using domino reactions, taking place at the cyclization of 2-[3-oxo-4-(phenylsulfanyl)butyl]-1,3-isoindolinediones in polyphosphoric acid.

Novel 1-R-3,4-dihydro-5H-benzothieno[2,3-d][1,2]diazepin-4-ones have been prepared by the cyclization of 2-acyl(aroyl)benzo[b]thiophene-3-acetic acids or 1-R-benzothieno[2,3-c]pyr-3-ones with hydrazine hydrate.

Despite steric hindrances created by the bulky substituent on the nitrogen atom, halogenation of 2,5-dialkyl-N-[arylsulfonylimino(phenyl)methyl]-1,4-benzoquinone monoimines fairly readily gives their derivatives having two halogen atoms in the quinoid ring.

6-Hydroxy-2-methyl(aryl)-1,3-benzoxazoles were synthesized by bromination of N -acetyl(aroyl)-1,4-benzoquinone monoimines.