Organoboron compounds

Conclusions The reaction of BCl₃ with N,N'-diphenylacetamidine in boiling benzene with treatment of the reaction mixture with water, methanol, or carboxylic acide yields derivatives of 4,4-dihydroxy-2-methyl-3-phenyl-1,4-dihydro-1-aza-3-azonia-4-boratonaphthalene.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 428–430, February, 1985.     

Synthesis and Structure of Octahedral Bis-Chelate Tin(IV) Derivative of the Ruthenocene Series

Cyclopalladated -(p-tolylimino)benzylruthenocene reacts with metallic tin in a way similar to ferrocene analogs, yielding bis-chelate diruthenocenyl tin(IV) compound as a result of transmetalation.     

New carborane-containing amino acids and their derivatives. Crystal structures of <Emphasis Type="Italic">n</Emphasis>-protected carboranylalaninates

New alanine derivatives containing both the carboranyl and trifluoromethyl groups were synthesized by the reaction of organometallic derivatives of o-carborane with methyl trifluoropyruvate imines. When using the 1R-(−)-menthoxycarbonyl protecting group at the nitrogen atom, one of diastereomers was isolated and characterized. Trifluoromethyl-carboranylalanine methyl esters containing different protecting groups at the nitrogen atom were studied by X-ray diffraction. Both complete and partial deprotection of the amino and carboxy groups was performed. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 761–767, April, 2007.     

Supramolecular organization of the crystals of allylsulfide clathrochelate: influence of the nature of solvate molecules

The influence of the nature of solvate molecules on the supramolecular organization of the crystals of -benzyldioximate FeBd₂((AllylS)₂Gm)(BF)₂ clathrochelate containing the allylsulfide substituents was studied by X-ray diffraction analysis.     

Reactions of dichloro-substituted iron(ii) clathrochelate with 1,4-dioxane radical derivatives: synthesis, structure, and spectral characteristics of the dioxane ring opening product in the ribbed fragment of the macrobicyclic ligand

A free-radical substitution for the chlorine atoms with the 1,4-dioxan-2-yl fragment in the tris-dichloro-substituted dioximate iron(II) clathrochelate is accompanied by the oxidative dioxane ring opening as a side process. The compound obtained was characterized by elemental analysis data, 1D and 2D ¹H and ¹³C{¹H} NMR spectroscopy (in solution), MALDI TOF mass spectrometry, as well as by single-crystal X-ray diffraction.     

Synthesis of 12-aryl-1-oxo-1,2,3,4,5,12-hexahydroindolo-[2,1-b]quinazoline-6-carbonitriles by recyclization of 11-aryl-1-oxo-2,3,4,5,10b,11-hexahydro-1H-indolo[2,3-b]quinoline-10b-carbonitriles

A general and convenient method for the synthesis of 12-aryl-1-oxo-1,2,3,4,5,12-hexahydroindolo[2,1-b]quinazoline-6-carbonitriles was proposed. The method is based on the recyclization of 11-aryl-1-oxo-2,3,4,5,10b,11-hexahydro-1H-indolo[2,3-b]quinoline-10b-carbonitriles. The structure of 12-(3-methoxyphenyl)-8-methyl-1-oxo-1,2,3,4,5,12-hexahydroindolo[2,1-b]quinazoline-6-carbonitrile was studied by X-ray diffraction analysis.     

Basicity of para-substituted tetraphenylporphyrins studied by two-phase spectropotentiometric titration

The basicity constants of a series of para-substituted tetraphenylporphyrins have been determined by two-phase spectrophotometric titration with pH monitoring in the chloroform-aqueous electrolyte solution system; the pH ranges of prevailing of the dication and the neutral forms of the porphyrins have been estimated. With introducing the donor substituents at the para-position of phenyl fragments of porphyrins, the compound basicity increases. Ionization constant of the pyrrole nitrogen atoms depends on the donor-acceptor properties of the substituents according to the Hammett equation. Basing on the derived dependence, theoretical basicity constants of the para-substituted porphyrins bearing strongly donor groups have been predicted.