共查询到20条相似文献,搜索用时 15 毫秒
1.
A. O. Finogenov M. A. Epishina A. S. Kulikov N. N. Makhova I. V. Anan’ev V. A. Tartakovsky 《Russian Chemical Bulletin》2010,59(11):2108-2113
A Mannich reaction of 4-amino-3-R-furoxans with paraformaldehyde in 10% aqueous H2SO4 led to the high yields of N,N′-bis(3-R-furoxan-4-yl)methylenediamines, whose structure (using R = Me as an example) was confirmed by X-ray diffraction
study. The N,N′-bis-(3-R-furoxan-4-yl)methylenediamines obtained were nitrated to N,N′-dinitro-N,N′-bis-(3-R-furoxan-4-yl)methylenediamines upon the action of 100% HNO3 in acetic or trifluoroacetic anhydride. 相似文献
2.
Fedoseev M. S. Glushkov V. A. Gorbunov A. A. Derzhavinskaya L. F. Oshchepkova T. E. 《Russian Journal of Applied Chemistry》2012,85(3):456-459
The reaction of N,N′-carbonyldiimidazole with ethanol and epoxy oligomers of diphenylolpropane diglycidyl ether and 4,4′-bis(glycidylamino)-3,3′-dichlorodiphenylmethane
was studied by gas chromatography- mass spectrometry and differential scanning calorimetry. From these oligomers and N,N′-carbonyldiimidazole transformation products, epoxy polymers were synthesized, and their physicomechanical and adhesion properties
were determined. 相似文献
3.
B. S. Fedorov N. I. Golovina V. V. Arakcheeva M. A. Fadeev G. V. Strukov V. V. Kedrov G. V. Shilov L. O. Atovmyan 《Russian Chemical Bulletin》1999,48(8):1584-1586
The reaction ofN,N′-bis(2-nitroxyethyl)pyridine-2,6-dicarboxamide with PdCl2 afforded previously unknowncis-(N-2-nitroxyethylpicolinamide-N,N′)dichloropalladium(II) andcis-[2-(2-pyridyl)-2-oxazoline-N,N′]dichloropalladium(II), which were isolated as a cocrystallizate of the molecular compounds. Its structure was established
by X-ray diffraction analysis.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1604–1606, August, 1999. 相似文献
4.
A. D. Kirilin A. A. Dokuchayev N. B. Sokova E. A. Chernyshev 《Russian Chemical Bulletin》1999,48(1):169-172
Reactions of carbofunctional organosilicon compounds withN,N-dimethyl-N′-trimethylsilylhydrazine andN,N-dimethyl-N′,N′-bis(trimethylsilyl)hydrazine were studied. The composition and structure of the reaction products were found to be dependent
on the reagent nature and the reaction conditions. 1,4-Dimethylamino-2,2,5,5-tetramethyl-1,4-diaza-2,5-disilacyclohexane,
a first representative of a new type of 2,5-disilapiperazines, was synthesized. A scheme of its formation was proposed.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 169–173, January, 1999. 相似文献
5.
M. E. Dmitriev E. A. Rossinets V. V. Ragulin 《Russian Journal of General Chemistry》2011,81(6):1092-1104
A new mild procedure of the amidoalkylation of hydrophosphoryl compounds in a mixture of acetic anhydride and acetyl chloride
was developed as a convenient method of constructing the α-aminophosphoryl fragment of the pseudo-α,α′-dipeptide molecule.
The reaction intermediates N,N′-benzylidene- and N,N′-alkylidenebiscarbamates were detected, isolated, and identified. The report presents the results of studying the direct
interaction of hydrophosphoryl compounds previously synthesized with biscarbamates in acetic anhydride and other solvents,
the influence of the structure of phosphorus component and biscarbamate, and the effect of acid catalysis on the course of
this two-component reaction. A new version of the mechanism of the three-component reaction of amidoalkylation of hydrophosphoryl
compounds is suggested: it is regarded as a multistage process involving the stage of biscarbamate formation followed by the
stage of Arbuzov-type reaction with the intermediate formation of acyliminium cation and P-OAc derivative with trivalent phosphorus. 相似文献
6.
The equilibrium constants, K
2, have been determined for the proton-transfer reactions of 1-phenacylquinolinium ion, PHQ+, with several amines {triethylamine (TEA), N,N,N′,N′-tetramethylethylenediamine (ED), N,N,N′, N′-tetramethylpropanediamine (PD), N,N,N′,N′-tetramethylbutanediamine (BD), and 1,8-bis(dimethylamino-naphthalene (DMAN)} in acetonitrile (AN), AN-tetrahydrofuran (THF)
and AN-ethanol (EtOH) mixtures. The reaction was followed spectrophotometrically using a stopped-flow technique. The K
2 value decreased for DMAN and increased for TEA with increasing vol-% of THF in AN-THF mixtures. The changes in the K
2 value for ED, PD and BD changed in the order: ED, PD and BD from a pattern similar to TEA to a pattern similar to DMAN. The
change in the K
2 value for DMAN with increasing vol-% of THF in AN-THF mixtures was explained by the effect of polarity on the stability of
P−Q+ (the deprotonated product of PHQ+). The effect of THF on the K
2 value is consistent with that of the peak wavelength of the absorption spectrum of P−Q+. The change in the K
2 value for TEA, ED, PD and BD depended on the structures of the protonated bases, one of the products for this reaction. The
effect of EtOH on the K
2 value for DMAN was examined in ternary EtOH-THF-AN mixtures that contain different amounts of EtOH and whose relative permittivities
were adjusted to that of EtOH. The K
2 value increased with increasing vol-% of EtOH because of the stabilization of P−Q+ upon the formation of the hydrogen-bonded complex with EtOH. The absorption spectrum of P−Q+ demonstrated a blue shift as the vol-% of EtOH increased. 相似文献
7.
A. S. Gordetsov S. V. Zimina S. V. Saprykina L. B. Loginova A. V. Piskunov V. F. Ur’yash E. M. Moseeva 《Russian Journal of General Chemistry》2011,81(4):658-662
1,3,5-Tris[bis(η5-cyclopentadienyl)chlorovanadium]melamin is prepared in high yield by the reaction of N,N′-bis(trimethylsilyl)dicyandiamide with bis(η5-cyclopentadienylvanadium) dichloride in tetrahydrofuran. As side products, trimethylchlorosilane and cyclopentadiene formed.
Reaction of N,N′-bis(trimethylsilyl) dicyandiamide with benzoyl chloride results in the formation of tris(benzoyl)melamin. 相似文献
8.
R. Muzzalupo F. Iemma N. Picci G. Pitarresi G. Cavallaro G. Giammona 《Colloid and polymer science》2001,279(7):688-695
Spherical polymeric microparticles have been prepared by a reverse-phase suspension polymerization technique. The starting
polymer was α,β-poly (N-2-hydroxyethyl)-dl-aspartamide (PHEA) partially functionalised with glycidylmethacrylate (GMA) in order to introduce reactive vinyl groups in
the side chain. The PHEA–GMA copolymer obtained (PHG) was cross-linked in a mixture of water/hexane–carbon tetrachloride in
the presence of sorbitan trioleate (Span 85) as surfactant and ammonium persulfate/N,N,N′,N′-tetramethylethylenediamine as initiator system. The reaction was also carried out in the presence of N,N′-dimethylacrylamide as comonomer or N,N′-ethylenebisacrylamide as a cross-linking agent. The beads obtained were characterized by Fourier transformIR spectrophotometry,
particle size distribution analysis and scanning electron microscopy, which revealed their microporous structure. X-ray diffractometry
and differential scanning calorimetry showed the amorphous state and the dependence of the glass-transition temperature on
the chemical structure of the samples prepared, respectively. Finally, in order to have information on the water affinity
of the networks obtained, swelling measurements were performed. The water regain values and the high rate of swelling demonstrate
a remarkable ability of the samples investigated to entrap water molecules. The dependence of aqueous swelling on the degree
of cross-linking and the chemical structure of the samples is also shown.
Received: 8 August 2000 Received in revised form: 6 November 2000 Accepted: 14 November 2000 相似文献
9.
Hong Zhou Zhiquan Pan Hanping Zhang Jingdong Hu Xuelei Hu Hong Zhou Zheng-He Peng 《Transition Metal Chemistry》2006,31(2):163-168
Two polyamine copper(II) complexes were synthesized by the reaction between N,N,N′,N′-tetrakis(2′-aminoethyl)propane-1,2-diamine hexahydrochloride and copper(II) perchlorate under almost the same conditions
except for reaction temperature. The crystal structures of two complexes were determined by X-ray diffraction techniques,
which shows that one of the complexes is unexpected and is a double chlorine or chloride-bridged dinuclear copper(II) complex
formed by two diethylenetriamines, and another is a pentadentate mononuclear copper(II) complex composed of homo-protonated
N,N,N′,N′-tetrakis(2′-aminoethyl)propane-1,2-diamine. The mechanism of the reaction leading to form the unexpected complex was discussed.
The UV-visible spectra and cyclic voltammogram of the complexes were measured. 相似文献
10.
I. E. Tolpygin 《Russian Journal of Organic Chemistry》2012,48(1):104-108
A number of 2-(anthracen-9-yl)-substituted imidazolidines and hexahydropyrimidines were synthesized by reaction of N,N′-bis[aryl(hetaryl)methyl]ethylene-1,2-diamines and N,N′-bis[aryl(hetaryl)methyl]-propane-1,3-diamines with anthracene-9-carbaldehyde. The obtained compounds showed chemosensor
activity toward Cd2+, Cu2+, and Hg2+ ions. 相似文献
11.
Yu Cui Yufen Hu Yanju Zhang Shaohong Yin Guoxin Sun 《Russian Journal of Inorganic Chemistry》2010,55(3):468-471
The extraction of uranyl nitrate with the novel extractant N,N′-dimethyl-N,N′-dioctylmalonamide (DMDOMA) from aqueous sodium nitrate (and nitric acid) was investigated. The extraction mechanism was
established and the stoichiometry of the main extracted species confirms to UO2(NO3)2 · DMDOMA. The IR spectral study was also made of the extracted species. Methyl substituent improves the extraction ability
of malonamide for U(VI) compared with that of N,N,N′,N′-tertrabutylmalonamide (TBMA). 相似文献
12.
Shuji Fujisawa Yusuke Okita Tsuguyuki Saito Eiji Togawa Akira Isogai 《Cellulose (London, England)》2011,18(5):1191-1199
A method for conversion of carboxyl groups present on the surface of TEMPO-oxidized cellulose nanofibrils to N-acylureas using carbodiimide was developed. A TEMPO-oxidized cellulose nanofibril with free carboxyl groups (TOCN–COOH) dispersed
in N,N-dimethylformamide (DMF) is prepared from a bleached kraft pulp, and then the TOCN–COOH is reacted with either N,N′-diisopropylcarbodiimide (DIC) or N,N′-dicyclohexylcarbodiimide (DCC) under apparently homogeneous conditions. FT-IR and solid-state 13C NMR analyses showed that the reaction products contained N-acylurea groups, and yields were >80%. Conversion ratios of carboxyl groups to N-acylureas are approximately 80 and 60%, when DIC and DCC, respectively, of 5 mol per mole of carboxyl groups are used as
the reagents. X-ray diffraction analysis demonstrated that neither crystallinity nor crystal width of the original wood cellulose
I structure was changed by the N-acylurea formation. The isolated and never-dried TOCN-N-acylureas are nano-dispersed in DMF but not in i-PrOH or dioxane. Pellets of the TOCN-N-acylureas had water-contact angles of >70°. 相似文献
13.
V. Ya. Sosnovskikh R. A. Irgashev I. A. Khalymbadzha 《Russian Chemical Bulletin》2007,56(8):1608-1611
Reaction of 3-(trifluoroacetyl)chromones with ethylenediamine and o-phenylenediamine depending on the nature of substituents and the reaction conditions afforded either mono-adducts, 3-[(2-aminoethyl)aminomethylidene]-and
3-[(2-aminophenyl)aminomethylidene]-2-hydroxy-2-(trifluoromethyl)chroman-4-ones, or bis-adducts, N,N′-ethylenebis-and N,N′-o-phenylenebis[3-aminomethylidene-2-hydroxy-2-(trifluoromethyl)chroman-4-ones].
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1548–1551, August, 2007. 相似文献
14.
A new approach is suggested for determining the kinetic parameters and rate constants of the elementary steps of reversible
chain reactions having self-acceleration periods due to the long time required for the concentrations of the chain-carrier
radicals to reach their steady-state values. This approach is illustrated by the example of the reversible chain reaction
between N,N′-diphenyl-1,4-benzoquinonediimine and 2,5-dichlorohydroquinone in chlorobenzene. The disappearance rate of one of the initial
reactants, N,N′-diphenyl-1,4-benzoquinonediimine, at the inflection point of its disappearance curve, is considered as the basic kinetic
characteristic of the reaction. The empirical function y = aexp(bt
c
) + d, where a, b, c, and d are the fitted parameters (b < 0, c > 1), is suggested for approximating the S-shaped kinetic curves and for calculating the reaction rate. The rate constants
of the elementary steps are preferably derived from experimental data obtained at equal concentrations of the initial reactants,
and also product additions when their effect on the reaction rate is studied. The effective rate constant of chain termination
is derived from the time to reach the steady state. The results obtained in this way are compared with earlier data obtained
using the “initial” reaction rates calculated by means of exponential approximation of portions of N,N′-diphenyl-1,4-benzoquinonediimine disappearance curves after the inflection point. 相似文献
15.
The study by 1H and 31P NMR spectroscopy has shown that phosphorylation of N,N-dimethylurea and diethylcyanamide with phosphorus pentachloride results in the formation of N′-(N,N-dialkylchloroformamidino) trichlorophosphonium hexachlorophosphorates where the positive charge of the organyltrichlorophosphonium
cation is delocalized over the system of the multiple bonds with participation of the lone electron pair of the nitrogen atom.
Bis-N′-(N,N-dialkylchloroformamidino)dichlorophosphonium hexachlorophosphorates, dichlorides of N,N-dialkylchloroformamidinophosphonic and thiophosphonic acids are synthesized where the conjugation of the phosphorus-containing
substituent with the chloroformamidinium part of the molecules is retained. Organyltetrachlorophosphoranes based on N,N-dimethylurea and diethylcyanamide exist in polar and nonpolar solvents as orhanyltrichlorophosphonium chlorides. 相似文献
16.
Methylene-bis[N′-oxydiazene-N-(β-hydroxyalkyl)N-oxides] were synthesized by the reaction of salts ofN-(β-hydroxyalkyl)-N′-hydroxydiazeneN-oxides with diahalomethanes. The effect of the nature of the starting reagents and the reaction condtions on the yields of
the target compounds was studied.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2266–2269, November, 1998. 相似文献
17.
Yu. V. Tomilov I. V. Kostyuchenko E. V. Shulishov B. B. Averkiev M. Yu. Antipin 《Russian Chemical Bulletin》2000,49(11):1919-1922
The addition of the phthalimidonitrene fragment, resulting from oxidation ofN-aminophthalimide by lead tetraacetate at −20 to −30°C, to the N=N-bond of 5-bromospirol[l-pyrazolinio-3,1′-cyclopropane]
(1) affords, apart from the stable 5-bromo-N {spiro[l-pyrazolinio-3,1′-cyclopropane]}-N-phthalimidoamide (azimine2), regioisomeric azimine3, which is completely transformed into 3-acetoxy-N-{spiro[l-pyrazolinio-5,1′-cyclopropane]}-N-phthalimidoamide (4) under the reaction conditions. The acetoxy group in this product easily undergoes nuclcophilic substitution on treatment
with McOH, NaN3, or the starting bromopyrazoline1. The structures of azimines obtained were established using NMR spectra, and the structure of the product of reaction of4 with1 was additionally proved by X-ray difraction data.
Published inIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 11, pp. 1949–1953, November, 2000. 相似文献
18.
Salts ofN-(β-hydroxyalkyl)-N′-hydroxydiazeneN-oxides, RCH(OH)CH2N(O)=NO− M+ (R=Me, Pri, or But; and M=Li, Na, K, Ag, NH4, or Me4N), were prepared. Their alkylation with alkyl halides R′X (X=Cl, Br, or I) and dimethyl sulfate was studied. Generally, alkylation
afforded mixtures ofN-(β-hydroxyalkyl)-N′-alkoxydiazeneN-oxides RCH(OH)CH2N(O)=NOR′ andO-alkyl-N-(β-hydroxyalkyl)-N-nitrosohydroxylamines RCH(OH)CH2N(NO)OR′.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1996–2001, October, 1998. 相似文献
19.
N. N. Golovnev G. V. Novikova A. A. Leshok 《Russian Journal of Inorganic Chemistry》2009,54(2):329-331
Stability constants at ionic strength I = 2 and 293 K were determined spectrophotometrically for multiligand bismuth(III) complexes with thiourea (Tu), N-phenylthiourea (Ptu), N-phenyl-N′-propylthiourea (Pptu), N,N′-diphenylthiourea (Bptu), and N-allyl-N′-propylthiourea (Aptu). The protonation constants of these ligands in perchloric acid solutions were also determined. The
stability of the listed complexes changes in the following order of ligands: aptu > tu > pptu > ptu > bptu. This order coincides
with the order of changing protonation constants.
Original Russian Text ? N.N. Golovnev, G.V. Novikova, and A.A. Leshok, 2009, published in Zhurnal Neorganicheskoi Khimii,
2009, Vol. 54, No. 2, pp. 374–376. 相似文献
20.
R. R. Khairullina B. F. Akmanov T. V. Tyumkina R. V. Kunakova A. G. Ibragimov 《Russian Journal of Organic Chemistry》2012,48(2):175-179
Efficient method was developed for thiols aminomethylation using N,N,N′,N′-tetra-methylmethanediamine in the presence of Sm and Fe salts. Aminosulfides were obtained in high yields and selectivity. 相似文献