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A new convenient method for the synthesis of 6-amino-2 H ,4 H -pyrano(2,3- c )pyrazole-5-carbonitriles, namely, four-component condensation of carbonyl compounds (aromatic aldehydes, heterocyclic ketones), malononitrile, β-keto esters, and hydrazine hydrate in ethanol in the presence of...
Cyclolinear permethylpolycarbosilanes were synthesized for the first time by the reaction of 1,3- and 1,4-dihydrodecamethylcyclohexasilanes H 2 Si 6 Me 10 with α,ω-diallylpermethyloligo-silanes All(SiMe 2 ) n All ( n = 1–6) in the presence of Karstedt’s catalyst. The molecular weight...
The molecular geometries and electronic structures of 2,4,6-tris(nitromethyl)-1,3,5-triazine isomers were investigated by the density functional method DFT/B3LYP/6-311++G** to elucidate the structural factors responsible for the stability of these systems. It was shown that a characteristic...
Hydrogenation of heptamethyl cycloheptatrieneheptacarboxylate in the presence of palladium/carbon affords a stereoisomer of heptamethyl cyclohepteneheptacarboxylate with the cis -position of five ester groups in a yield of 60%, as well as the corresponding cyclohepta-1,3-dienes as trans,trans -...
Organopolychlorine compounds (CCl 4 , CCl 3 CO 2 Et, CCl 3 CHO) add at the double bond of various olefins under the catalysis of the metal phthalocyanine complexes. A possibility of quantitative catalyst recovery was shown.
High molecular weight nitroxyl radicals formed directly in polymerization system ( in situ ) from N-tert -buiyl- C -phenylnitrone are efficient agents for the chain growth control and allow one to perform synthesis of di- and triblock-copolymers based on a number of vinylic monomers (styrene,...
Adsorption of a mixture of benzene and chlorobenzene from the gas phase on the carbon adsorbent D4609 (Purolite Int.) obtained by the pyrolysis of hypercrosslinked polystyrene was studied. The adsorption of the binary vapor mixture is satisfactorily described in terms of the theory of ideal...
Aromatic polyamides were synthesized by the reaction of dinitriles and bisphenols at 160–220 °C for 12–20 h in the presence of catalytic amounts of aluminum or antimony(III) chlorides. The polymers are completely soluble in concentrated sulfuric and formic acids at room temperature and in...
The modified lattice-gas model is used to construct the model and the concentration profiles of the liquid—vapor for spherical drops of different size. A monotonic character of the temperature dependence of the width of the transition layer between the liquid and the vapor is demonstrated. The...
The structures and spectral luminescence properties of two similar in structure β-diketonatoboron difluorides were studied in comparison. One of them (1-(2,4,6-trimethyl-phenyl)butane-1,3-dionatoboron difluoride ( 1 )) contains two methyl groups in the both ortho -positions of the phenyl ring,...
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