Copolymerization of Vinyl Chloride with 1-Vinyl-1,2,4-triazole

Copolymerization of vinyl chloride with 1-vinyl-1,2,4-triazole was studied. The copolymerization constants were determined. The chemical structure of the resulting copolymers was studied by NMR and IR spectroscopy.     

Copolymerization of 1-Vinyl-1,2,4-triazole with 2-Hydroxyethyl Methacrylate

Radical copolymerization of 1-vinyl-1,2,4-triazole with 2-hydroxyethyl methacrylate in dimethylformamide and ethanol, initiated with azobis(isobutyronitrile), was studied. The copolymerization constants of this pair of monomers at low conversions and the microstructure parameters were determined. New highly hydrophilic thinly cross-linked copolymers were prepared from these monomers in the presence of crosslinking agents.     

乙烯-甲基丙烯酸甲酯共聚物结构的~1H NMR和~(13)C NMR表征

采用核磁共振(1H NMR、13C NMR)技术对由双[N-(2,6-二异丙基苯基)-3-异丙基水杨醛亚胺]镍(Ⅱ)配合物/甲基铝氧烷(Methylaluminoxane,MAO)催化乙烯-甲基丙烯酸甲酯共聚得到的共聚物(EMMA-a)的微观结构和组成进行了详细的分析与表征,同时对自由基聚合制得的乙烯-甲基丙烯酸甲酯共聚物(EMMA-b)作了相应的分析与表征。通过1H NMR数据,计算得到两种共聚物样品中共聚单体甲基丙烯酸甲酯(MMA)的插入率分别为14.10%和10.26%(摩尔百分数)。基于13C NMR数据,分析比较了由配位共聚与自由基共聚所得共聚物样品在微观结构上的区别,结果发现,在共聚物的乙烯链段部分,由配位共聚得到的共聚物样品EMMA-a主要含有甲基型支链,而由自由基共聚所得共聚物样品EMMA-b具有长链型支链。另外,在共聚物的MMA链节部分,EMMA-a中的MMA单元的羰基(C‖O)碳的化学位移为177.27,而EMMA-b中的MMA单元的羰基(C‖O)碳的化学位移为175.96。     

Electrochemical Synthesis of Polymer Complexes with Selected Metals Based on 1-Vinyl-1,2,4-triazole

Russian Journal of General Chemistry - A single-stage electrochemical synthesis of polymer complexes of Fe, Co, Ni, and Cu based on 1-vinyl-1,2,4-triazole has been elaborated. It has been found...     

Study of the rotational isomerism of 1-vinyl-1,2,4-triazoles by 1H and 13C NMR spectroscopy

Quantitative evaluations of the percentages of rotational isomers in 1-vinyl-1,2,4-triazoles were obtained. The population of the s-cis(N₍₂₎) form in 1-vinyl-1,2,4-triazole is greater by a factor of two than in the s-trans form.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 365–368, March, 1991.     

1-Vinyl-1,2,4-triazole in copolymerization reaction with 1-vinyl-4,5,6,7-tetrahydroindole: synthesis and properties of copolymers

A radical copolymerization of 1-vinyl-1,2,4-triazole (VTA) with 1-vinyl-4,5,6,7-tetrahy-droindole (VTHI) was studied. New thermally stable functional copolymers of different composition, well soluble in organic solvents were synthesized. It was found that VTA has higher reactivity as compared to VTHI. A new soluble polymeric nanocomposite with metallic silver nanoparticles encapsulated into the matrix of synthesized copolymer was obtained.     

13C NMR spectra of some 1,2-disubstitutedN-vinyl-1H-1,2,4-triazoles

¹³C NMR spectra (20 and 75 MHz, in DMSO-d₆) of a series of 1,3-diaryl-3-(1H-1,2,4-triazol-1-yl)- and 1,3-diaryl-2-(1H-1,2,4-triazol-1-yl)prop-2-en-1-ones were registered. It was shown that the chemical shifts of both the carbon atom of the alkene group and C(3) reflect regio- and stereoisomerism of these compounds. Taking this into account the isomeric structures of several 1,3-diaryl-3-(1H-1,2,4-triazol-1-yl)prop-2-en-1-ones were identified and the configurations relative to the double bond of a number of 1,3-diaryl-2-(1H-1,2,4-triazol-1-yl)prop-2-en-1-ones were determined.     

Structure and properties of 3-amino-1-vinyl-1,2,4-triazole

The reaction of acetylene with 3-amino-1,2,4-triazole forms two isomeric 3-amino-N-vinyl-1,2,4-triazoles. Their structures have been studied by PMR and IR spectroscopy and dipole moments. The high activity of the new vinyl compounds of the azole series in the addition of electrophilic reagents, in polymerization, and in complex formation has been shown.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1566–1569, November, 1973.     

Microstructures of a Hydrogenated Styrene-Butadiene Copolymer by 13C NMR

Abstract

The microstructure and sequence distribution of a styrene-ethylenebutene-1 copolymer obtained by quantitative hydrogenation of emulsion styrene-butadiene rubber (SBR) was determined using ¹³C NMR. The results show that the polymer has 82% (CH₂)_>6 units arising due to BBB', SBB and BBB triads (B = hydrogenated 1,4 butadiene, B' = butene-1 and S = styrene). The presence of long crystallizable methylene sequences results in a melting endotherm at 45°C for the hydrogenated SBR.     

1H and 13C NMR Study of the Structure of Alkylthio Enyne Alcohols and Glycols

Steric structure of some alkylthio enyne alcohols and glycols was determined by ¹H and ¹³C NMR spectroscopy. Analysis of cross peaks in the 2M NOESY spectra showed that the double bond in these compounds has Z configuration. Criteria were found which indicate the position of the hydroxy-containing substituent with respect to the triple or double bond.     

Synthesis of 1-methyl-1,2,4-triazole

Conclusions 1-Methyl-1,2,4-triazole was synthesized from formaldehyde N-methyl-N-tosylhydrazone and ammonia.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1636–1637, July, 1979.     

13C NMR STUDY OF SUBSTITUENT EFFECTS IN 1,2,4-OXADIAZOLE AND 1,2,4-THIADIAZOLE DERIVATIVES

¹³C chemical shifts of C═N, C═O and C═S carbons of 3,4-disubstituted-1,2,4-oxadiazole-5-ones(thiones) and 3,4-disubstituted-1,2,4-thiadiazole-5-ones have been determined in CDCl₃ solution. Exceptionally good Hammett correlations of ¹³C NMR chemical shifts of these carbons with σ were obtained. The negative ρ values observed (inverse substituent effects) indicate π-polarization of the C═N, C═O and C═S bonds. As expected, the long distance C═O and C═S ¹³C chemical shifts were found less susceptible to substituent-induced electronic changes.     

H NMR, C NMR and mass spectral studies of some Schiff bases derived from 3-amino-1,2,4-triazole

Heterocyclic Schiff bases derived from 3-amino-1,2,4-triazole and different substituted aromatic aldehydes are prepared and subjected to ¹H NMR, ¹³C NMR and mass spectral analyses. ¹H NMR spectra in DMSO exhibit a sharp singlet within the 9.35–8.90 ppm region which corresponds to the azomethine proton. The position of this signal is largely dependent on the nature of the substituents on the benzal moiety. It is observed that the shape, position and the integration value of the signal of the aromatic proton of the triazole ring (⁵C) are clearly affected by the rate of exchange, relaxation time, concentration of solution as well as the solvent used. ¹³C NMR is taken as substantial support for the results reached from ¹H NMR studies. The mass spectral results are taken as a tool to confirm the structure of the investigated compounds. The base peak (100%), mostly the M-1 peak, indicates the facile loss of hydrogen radical. The fragmentation pattern of the unsubstituted Schiff base is taken as the general scheme. Differences in the other schemes result from the effect of the electronegativity of the substituents attached to the aromatic ring.     

Synthesis and Molecular Structure of 1,5-Diphenyl-3-phenacylthio-1H-1,2,4-triazole

1 INTRODUCTION 1,2,4-Triazole and its derivatives are very useful compounds due to their broad spectrum of pharmacological activities, such as antitumor[1], antiviral[2 ～ 4], antibacterial[5] and antifungal[6] activities. Moreover, they can be used as ver- satile ligands for transition metals. Particularly, they exhibit a strong and typical property of act- ing as bridging ligands between two metal cen- ters[7, 8]. 3-Substituted thio-1H-1,2,4-triazole is the important 1,2,4-triazole deri…     

Ab Initio Calculation of the Structure of 5-Chloro-1,2,4-triazole

Three tautomeric forms of 5-chloro-1,2,4-triazole were calculated using the Hartree-Fock (ab initio) and Meller-Plesset methods in the 6-31G(d) basis. The ³⁵Cl NQR parameters were calculated using the occupancies of the 3p-components of the valence p-orbitals of the chlorine atom. The structure of this triazole was derived from the data obtained.     

Structure elucidation and 13c NMR assignment of an 1,2,4-oxadiazole substituted pyrazole

The orientation of the substituent groups in an 1,2,4-oxadiazole substituted pyrazole, formed by reaction of a phenylnitrile oxide with an unsymmetrically substituted hydrazine is determined. One-dimensional methods as the selective INEPT and ¹³C{¹H} nOe experiments are used. Both techniques provide also an unambiguous assignment of the ¹³C nmr spectrum.     

聚酰胺-胺型树枝状大分子1H和13C-NMR研究

采用发散合成法合成了0．5～3.0代的树枝状大分子聚酰胺-胺，测定了系列聚酰胺-胺的^1H—NMR和^13C—NMR谱，结果表明，合成产物的分子结构与理论结构相符，而^13C—NMR谱的测定结果表明了整代产品中含有少量的原料乙二胺，合理地解释了随着支化代的增加，收率超过100％这一实验现象．