The Question of Electrophilic vs Nucleophilic Addition of Cyclic β‑Dicarbonyl Phenyliodonium Ylides: Electrophilic Cycloaddition of Diphenylketene

The reaction of β-dicarbonyl phenyliodonium ylides with diphenylketene at room temperature affords mixtures of lactone and aurone derivatives. The initial electrophilic attack of the iodonium ylide on the C_β position of the diphenylketene, followed by cyclization of the zwitterionic species, and subsequent ejection of iodobenzene, affords the lactone and aurone cycloadducts. Treatment of β-dicarbonyl iodonium ylides with acyl chlorides yields α-chloroenones with good to excellent yields

The Question of Electrophilic vs Nucleophilic Addition of Cyclic β‑Dicarbonyl Phenyliodonium Ylides: Electrophilic Cycloaddition of Diphenylketene

The reaction of β-dicarbonyl phenyliodonium ylides with diphenylketene at room temperature affords mixtures of lactone and aurone derivatives. The initial electrophilic attack of the iodonium ylide on the C_β position of the diphenylketene, followed by cyclization of the zwitterionic species, and subsequent ejection of iodobenzene, affords the lactone and aurone cycloadducts. Treatment of β-dicarbonyl iodonium ylides with acyl chlorides yields α-chloroenones with good to excellent yields

The Question of Electrophilic vs Nucleophilic Addition of Cyclic β‑Dicarbonyl Phenyliodonium Ylides: Electrophilic Cycloaddition of Diphenylketene

The reaction of β-dicarbonyl phenyliodonium ylides with diphenylketene at room temperature affords mixtures of lactone and aurone derivatives. The initial electrophilic attack of the iodonium ylide on the C_β position of the diphenylketene, followed by cyclization of the zwitterionic species, and subsequent ejection of iodobenzene, affords the lactone and aurone cycloadducts. Treatment of β-dicarbonyl iodonium ylides with acyl chlorides yields α-chloroenones with good to excellent yields

The influence of varied factors on enterprise’s solvency

У тезах розглянуто можливість впливу різноманітних факторів діяльності підприємства на його кредитоспроможність.The influence of varied factors on enterprise’s solvency is analyzed in the article

Crystal Structure, Thermal Behavior, and Photochemical Reactivity of a Series of Co-Crystals of <i>trans</i>-1,2-Bis(4-pyridyl) Ethylene with Dicarboxylic Acids

A series of co-crystals of <i>trans</i>-1,2-bis­(4-pyridyl) ethylene (bpe) with aliphatic saturated or unsaturated dicarboxylic acids, of the type [(bpe)­(L)] (L = dicarboxylic acid), were prepared and characterized by single crystal X-ray crystallography. In all cases chains of the type acid···bpe···acid were formed via strong O–H···N hydrogen bonds. The chains were further linked between them by weak C–H···O hydrogen bonds, π–π and herringbone interactions to form three-dimensional structures. Thermal analysis showed considerable elevation of the melting/decomposition point of the co-crystals with respect either to both components or to bpe, ascribed to the formation of multiple complementary C–H···O bonds as well as to π–π interactions between the two conformer molecules. When L = fumaric acid, the two components stack separately with their CC bonds strictly parallel between them at 3.83 Å from one another. However, photodimerization reaction takes place only between the olefin bonds of bpe. Photodimerization reaction between one CC bond of the acid and that of bpe was also induced when L = <i>trans</i>,<i>trans</i>-muconic acid

Crystal Structure, Thermal Behavior, and Photochemical Reactivity of a Series of Co-Crystals of <i>trans</i>-1,2-Bis(4-pyridyl) Ethylene with Dicarboxylic Acids

A series of co-crystals of <i>trans</i>-1,2-bis­(4-pyridyl) ethylene (bpe) with aliphatic saturated or unsaturated dicarboxylic acids, of the type [(bpe)­(L)] (L = dicarboxylic acid), were prepared and characterized by single crystal X-ray crystallography. In all cases chains of the type acid···bpe···acid were formed via strong O–H···N hydrogen bonds. The chains were further linked between them by weak C–H···O hydrogen bonds, π–π and herringbone interactions to form three-dimensional structures. Thermal analysis showed considerable elevation of the melting/decomposition point of the co-crystals with respect either to both components or to bpe, ascribed to the formation of multiple complementary C–H···O bonds as well as to π–π interactions between the two conformer molecules. When L = fumaric acid, the two components stack separately with their CC bonds strictly parallel between them at 3.83 Å from one another. However, photodimerization reaction takes place only between the olefin bonds of bpe. Photodimerization reaction between one CC bond of the acid and that of bpe was also induced when L = <i>trans</i>,<i>trans</i>-muconic acid