Results 1 - 10 of 1070
Results 1 - 10 of 1070. Search took: 0.023 seconds
|Sort by: date | relevance|
[en] The gas-phase pyrolysis of isomeric 2-chloro-2-fluoro-1-phenylcyclopropanes in a flow reactor at 250–430 °С gives 1-phenyl- and 3-phenyl-3-chloro-2-fluoropropenes. Under similar conditions, methyl-substituted gem-chlorofluorocyclopropanes undergo cyclopropyl—allyl isomerization accompanied by dehydrochlorination to form chlorofluoroalkenes and 2-fluoro-buta-1,3-dienes.
[en] This review integrates and describes systematically the data in the field of spiro[2.4]hepta-4,6-dienes published in the past 15 years. The changes in the development of studies that took place during this period are noted. The methods for the synthesis, the reactivity details and key chemical transformations of spiro[2.4]hepta-4,6-dienes are considered, with the emphasis on applications of these compounds in organic synthesis. The bibliography includes 207 references
[en] The stereoselectivity of the intramolecular Diels-Alder reactions of 1 and its derivatives were investigated by ab initio calculations. The stereoselectivity mainly originates from the steric repulsion and the orbital interactions. The additional s-cis and s-trans conformations by introducing the carbonyl group at the neighbor of diene or dienophile may change the stereoselectivity, hence this kind of substitution can be utilized for stereoselective asymmetric synthesis
[en] An efficient synthetic method of Z-selective 3-ethoxycarbonyl-2-halo-1,3-dienes and 3-vinyl-2-halo-1,3-dienes was developed from the reaction of allenols having ethoxycarbonyl and vinyl group with indium trihalides at room temperature in CH2Cl2
[en] The review covers methods of synthesis, structure and properties of cross-conjugated dienones, viz., bis(arylmethylidene) derivatives of cyclic ketones and their heteroanalogues. The regio- and stereochemistry of the reactions of dienones depending on the ring size and the nature of substituents is analysed.
[en] The scope of this review encompasses methods and synthetic protocols leading to conjugated dienes bearing no heteroatoms in the C=C-C=C moiety. Attention is concentrated on methodologies developed during the last decade, particularly, to the metal complex-mediated synthesis. The bibliography includes 494 references.
[en] The published data on the major methods for the synthesis and chemical conversions of titanocene derivatives containing titanium-carbon σ-bonds are systematised. The bibliography includes 288 references.
[en] The review focuses on the methods of synthesis of 2-(1-alkoxyalkylidene)-1,3-dicarbonyl compounds and their chemical transformations. The reactivity of such compounds toward various mono- and dinucleophilic reagents is considered. The potential of these compounds for synthesis of different acyclic, carbo- and heterocyclic molecules is demonstrated. Special attention is paid to the practical use of 2-(1-alkoxyalkylidene)-1,3-dicarbonyl compounds and their derivatives, which are of interest in medicine and for design of new materials. The bibliography includes 226 references
[en] Data on the synthesis of previously unknown semicoordination compounds of Re(3) by means of π-C5H5 Re(CO)3 and π-C5H5 Re(CO)2 PPh3 oxidation by chlorine, thionyl chloride, iodine are presented. Chlorination has been carried out in the range of -15-+29 deg in the CH2Cl2, CCl4 media. Iodination of π-C55 Re( O)3 is performed in DMCO at 20 deg. Chemical properties, structure, isomery of the compounds obtained are studied