M. O. Dekaprilevich

Electrochemical transformation of cyanoacetic ester and aldehydes into 3-substituted 1,2-dicyanocyclopropane-1,2-dicarboxylates

Abstract Electrolysis of cyanoacetic ester in the presence of aldehydes and NaBr in alcohols in an undivided cell results in formation of 3-substituted 1,2-dicyanocyclopropane-1,2-dicarboxylates.

Oxidative macrocyclocondensation of 3,4-diaminofurazan and 4,4′-diamino-3,3′-azofurazan with dibromoisocyanurate. Crystal structures of hexa- and octadiazenofurazan macrocycles

The oxidative cyclocondensation of 3,4-diaminofurazan and 4,4′-diamino-3,3′-azofurazan with dibromoisocyanurate afforded macrocyclec polydiazenofurazans. The reaction can be directed towards the formation of both the four-membered cycle alone or the three-, six-, and eight-membered macrocycles.

Synthesis and molecular structure of 3-bromo-trans-2,6-diallyl-?3-piperideine hydrochloride

The structure of 3-bromo-trans-2,6-diallyl-Δ3-piperideine hydrochloride was determined by X-ray diffraction analysis. The corresponding base was prepared by reductive diallylation of 3-bromopyridine with triallylborane. 3-Bromo-cis-2,6-diallyl-Δ3-piperideine3 was prepared by heatingtrans-isomer2 with triallylborane at 130 °C followed by deboronation of the resulting aminoborane with a solution of sodium hydroxide.

Synthesis and structure of 2,5,7,10-tetramethyl-2,4,8,10-tetraazabicyclo[4.4.0]decane-3,9-dione

Abstract2,5,7,10-Tetramethyl-2,4,8,10-tetraazabicyclo[4.4.0]decane-3,9-dione, a regioisomer of the previously known 2,5,7,8-tetramethyl-2,4,8,10-tetraazabicyclo[4.4.0]decane-3,9-dione, has been synthesized, and its structure has been established by X-ray diffraction analysis. The bicyclic system of this molecule is formed by two heterocyclescis-annelated through the C(1)-C(6) bond. The relative configurations of the asymmetric centers areS for C(5), andR for C(7). In the monohydrate crystal studied, the molecules are linked by O...H-Ow and O...H-N type H-bonds forming a three-dimensional framework.

Synthesis of 3-substituted 4-imino-4,5-dihydro-1,2,3-triazole 1-oxides and 4-amino-1,2,3-triazole 1-oxides. Crystal and molecular structure of 4-imino-5,5-dimethyl-3-phenyl-4,5-dihydro-1,2,3-triazole 1-oxide

A new procedure for the synthesis of triazole N-oxides, based on base-induced intramolecular cyclization of 1-(α-cyanoalkyl)-3-aryl(hetaryl)triazen-1-oxides, is proposed. An X-ray study of 4-imino-5,5-dimethyl-3-phenyl-4,5-dihydro-1,2,3-triazole 1-oxide was carried out.

6,6′-Bis(1,5-diazabicyclo[3.1.0]hexane)

The interaction of 1,3-diaminopropane with glyoxal and NaOCl in water at pH 9.5–10.5 afforded the previously unknown 6,6′-bis(1,5-diazabicyclo[3.1.0]hexane). According to X-ray diffraction data, both bicyclic fragments of the title compound adopt a boat conformation.

Crystal Structure of the E-2,4-Dinitrophenylhydrazone of 2-Acetyl-3-phenyl-5-methylfuran

The molecular structure of the title E-(syn)-2,4-dinitrophenylhydrazone (DNPH) has been determined and compared with that of the known parent ketone. Semiempirical (AM1, PM3) and molecular mechanics (MM+, Sybyl) calculations gave inconclusive results regarding the possible configurations (syn versus anti) and conformations (s-cis versus s-trans). In the crystal the title molecule is almost planar in an s-trans conformation with the phenyl ring twisted by 30.0° out of the furan plane. Thus, the present DNPH, in the syn configuration, mimics very well the conformation of the parent crystalline ketone. The previous assignment based on solution data of this DNPH as anti is incorrect. It is thus shown that due to the strong intramolecular hydrogen bond NH⋯O2N (ortho) within the DNPH part, the syn-anti DNPH formation is not affected by the putative hydrogen bond to the furanic oxygen atom.

Synthesis and molecular structure oftrans-2,6-dimethallyl-1,1-dimethyl-1,2,3,6-tetrahydropyridinium iodide

The structure oftrans-2,6-dimethallyl-1,1-dimethyl-1,2,3,6-tetrahydropyridinium iodide was established by X-ray structural analysis. The corresponding base was synthesized by reductive diallylation of pyridine with trimethallylborane in the presence of 2-propanol.

Nucleophilic substitution reactions of 2,4,6-tris(trinitromethyl)-1,3,5-triazine. 2. interaction of 2,4,6-tris(trinitromethyl)-1,3,5-triazine with primary amines and hexamethyldisilazane

Abstract2-R-amino-4,6-bis (trinitromethyl)-1,3,5-triazines have been synthesized, and their structures have been established. Dynamic13C NMR spectroscopy has been used to measure the rotational barriers of the tertbutylamino group around the C(2)-NHBu-t bond in 2-(tert-butylamino)-4,6-dichloro-1, 3, 5-triazine and 2-(tertbutylamino)-4,6-dimethoxy-1,3,5-triazine. X-ray diffraction was used to investigate the structure of 2-(tertbutylamino)-4,6-bis (trinitromethyl)-1,3,5-triazine. From the results obtained in this work it has been concluded that the bond between the NHBu-t group and the triazine ring has a partial double-bond character.

NOVEL CONJUGATED POLYNITRILES BASED ON AMINAL ACETAL OF DIMETHYLAMINOMETHYLENEMALONALDEHYDE

Depending on the reaction conditions, dimethylaminomethylenemalonaldehyde aminal acetal reacts with malonodinitrile or alkyl cyanoacetates to give various neutral or ionic cross-conjugated polynitriles. Cation-anionic cyanine dyes were obtained from tri- and tetracyanopolymethine salts. The conformation and geometric parameters of the tetramethyl 3-dimethylaminomethylenepenta-1,4-diene-1,1,5,5-tetracarboxylate molecule were established by X-ray diffraction analysis.