K. A. Lysenko

Crystal structure, IR and 1H NMR spectra of tetranitratobis μ-(2,4,6,8-tetraethyl-2,4,6,8-tetraazabicyclo[3.3.0]octane-3,7-dione-O,O′)]diethanolodicadmium

The crystal structure of [Cd2(μ-BC)2(NO3)4(EtOH)2] (I), where BC is C12H22N4O2 (bicaret), has been determined. The crystals are composed of dimeric centrosymmetrical molecules. The cadmium coordination polyhedron is a trigonal bipyramid. Bicaret is a bidentate bridging ligand coordinated to the metal through two oxygens of the carbonyl groups. The IR and 1H NMR spectra of I are studied and interpreted.

Structure of peri-hydroxy- and peri-methoxy-substituted aldehydes and ketones according to spectral data and quantum-chemical calculations

The structure of peri-hydroxy- and peri-methoxy-substituted aldehydes and ketones of the naphthalene, acenaphthene, and acenaphthylene series and the nature of intramolecular interactions between the peri- substituents therein were determined by spectral (IR, UV, 1H NMR), X-ray diffraction, and quantum-chemical methods.

peri-Amino ketones of the acenaphthene and acenaphthylene series

Abstractperi-Amino-substituted methyl and aryl ketones of the acenaphthene and acenaphthylene series were subjected to protonation and acylation at the nitrogen atom, dehydrogenation, and reactions with aldehydes. Conformations of substituents in the peri positions and probability for their participation in intra- and intermolecular transformations were determined on the basis of spectral data and quantum-chemical calculations.

3,3′-bi(6,8-dialkyl-2,4-dioxa-7-thia-6,8-diazabicyclo[3.3.0]-octane-7,7-dioxides): Structure and synthesis

Derivatives of a new heterocyclic system, 3,3′-bi(6,8-dialkyl-2,4-dioxa-7-thia-6,8-diazabicyclo[3.3.0]-octane-7,7-dioxides), were synthesized by condensation of 1,3-dialkylsulfamides with glyoxal (as a dihydrate trimer). Their structure was investigated by spectral methods, XRD, and X-ray phase analysis of one among these compounds.

Oxidative transformatons of 2-aryl-1,2,3,4,7,8-hexahydroacenaphtho[5,6-bc]azepin-4-ones

Reactions of partial (elimination of H2 from the bimethylene unit) and exhaustive (elimination of 2H2 from the bimethylene unit and the seven-membered heterocycle) dehydrogenation of 2-aryl-1,2,3,4,7,8-hexahydroacenaphtho[5,6-bc]azepin-4-ones were performed. The effect of the electronic structure of initial and dehydrogenated compounds on their spectral characteristics was discussed. New peri-fused heterocyclic systems were obtained.

peri-hydroxy acenaphthoyl compounds

Reactions of peri-hydroxyacenaphthaldehyde and its O-methyl derivative with amines, aryl methyl ketones, and malononitrile gave the corresponding Schiff bases, chalcones, and arylidenemalononitrile. The latter underwent heterocyclization on heating in trifluoroacetic acid to produce 2-oxoacenaphtho[5,6-bc]-oxepine-3-carbonitrile. The condensation of 5-acetyl-6-hydroxyacenaphthene with aromatic aldehydes afforded chalcones, their mixtures with heterocyclization products, or 2-arylacenaphtho[5,6-bc]oxepin-4-one, depending on the substituent in the aromatic ring.

1-azaacepleiadylene—A novel peri-fused heterocyclic system

Treatment of 2-aryl-1H,4H-2,3,7,8-tetrahydroacenaphtho[5,6-bc]azepin-4-one with hydrazine hydrate on heating in ethylene glycol in the presence of alkali resulted in the reduction of the oxo group to CH2. Dehydrogenation of the reduction product with 2,3,5,6-tetrachloro-1,4-benzoquinone gave 2-aryl-1-azaacepleiadylene which is the first representative of a novel peri-fused heterocyclic system.

Synthesis and structure of 2,4,6,8-tetramethyl-3,7-dithia-2,4,6,8-tetraazabicyclo[3.3.0]octane 3,3,7,7-tetraoxide

Condensation of N,N′-dimethylsulfamide with glyoxal gave 2,4,6,8-tetramethyl-3,7-dithia-2,4,6,8-tetraazabicyclo[3.3.0]octane 3,3,7,7-tetraoxide, a sulfur-containing analog of 2,4,6,8-tetramethyl-2,4,6,8-tetraazabicyclo[3.3.0]octane-3,7-dione (Mebicar). The product structure was studied by X-ray analysis.

Synthesis and structure of 1,3-dialkyl-4-(sulfonylimino)imidazolidin-2-ones

The reactions of 1,3-dialkyl-4,5-dihydroxyimidazolidin-2-ones with alkyl sulfamides have been studied and previously undescribed 1,3-dialkyl-4-(alkylaminosulfonylimino)imidazolidin-2-ones have been obtained. The structure of 1,3-dimethyl-4-(benzenesulfonylimino)imidazolidin-2-one was investigated by X-ray structural analysis.