Tag: M.W=200-250

Wang, Xinhong published the artcileSynthesis and thermal analysis of thioperoxydicarbonimidic diamide ([(H₂N)C(NH)]₂S₂) dihydrochloride (formamidine disulfide dihydrochloride), Product Details of C2H8Cl2N4S2, the publication is Yingyong Huagong (2006), 35(8), 580-582, 590, database is CAplus.

Formamidine disulfide dihydrochloride was prepared using hydrochloric acid and thiourea, hydrogen peroxide as oxidant in a reactor. The optimized reaction conditions were determined and the product was characterized by IR, UV. Combustion heat of product was 3181.75 kJ/mol. Thermal anal. results indicated formamidine disulfide dihydrochloride exhibited complex behaviors from the curves of TG-DTA-DTG, firstly including two first order decomposition reactions and its apparent activation energy was 155.71 kJ/mol (36.12 kJ/mol).

Yingyong Huagong published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C6H5F4NO3S, Product Details of C2H8Cl2N4S2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Cicek, Metin published the artcileHalf-sandwich Ru(II) arene complexes bearing benzimidazole ligands for the N-alkylation reaction of aniline with alcohols in a solvent-free medium, Quality Control of 52818-63-0, the publication is New Journal of Chemistry (2021), 45(25), 11075-11085, database is CAplus.

The direct N-alkylation reactions of amines with alc. derivatives using the borrowing hydrogen methodol. were investigated. For this purpose, a new series of half-sandwich ruthenium(II) complexes bearing N-coordinated benzimidazole complexes were synthesized and fully characterized by FT-IR, ¹H NMR and ¹³C NMR spectroscopies. Addnl., the structures of the complexes were characterized by X-ray crystallog. All new complexes were investigated for their catalytic activities in the alkylation of amines with alc. derivatives It was found that alkylation reactions in a solvent-free medium were efficient and selective.

New Journal of Chemistry published new progress about 52818-63-0. 52818-63-0 belongs to ethers-buliding-blocks, auxiliary class Pyridine,Amine,Benzene,Ether, name is N-(4-Methoxybenzyl)pyridin-2-amine, and the molecular formula is C13H14N2O, Quality Control of 52818-63-0.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wang, Shun published the artcileHeat effect in oxidation of thiourea, HPLC of Formula: 14807-75-1, the publication is Zhongguo Kuangye Daxue Xuebao (2004), 33(4), 375-378, database is CAplus.

The enthalpies of combustion of thiourea, formamidine disulfide dihydrochloride, thiourea dioxide, and thiourea trioxide were measured using an oxygen bomb calorimeter, and from which the molar standard enthalpies of formation of formamidine disulfide dihydrochloride, thiourea dioxide, and thiourea trioxide were obtained with values of 8.19, -431.49 and -833.32 kJ/mol, resp. Further, the molar standard reaction enthalpies, for the formation of formamidine disulfide dihydrochloride, thiourea dioxide and thiourea trioxide via the reactions between thiourea and hydrogen peroxide, were also calculated utilizing the data of combustion enthalpies or formation enthalpies. The two calculations are almost the same. Their values are 127.11-127.12, -543.66–543.64 and -1 043.56–1 043.53 kJ/mol, resp.

Zhongguo Kuangye Daxue Xuebao published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C6H4ClNO2, HPLC of Formula: 14807-75-1.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Francisco, Vitor published the artcileKinetic study of an autocatalytic reaction: nitrosation of formamidine disulfide, Application In Synthesis of 14807-75-1, the publication is New Journal of Chemistry (2008), 32(12), 2292-2298, database is CAplus.

The reaction kinetics for the acid nitrosation of formamidine disulfide (FDS) show an autocatalytic behavior that arises from the fact that the thiocyanate ion formed as a product acts as a powerful catalyst for the nitrosation reaction. In the presence of added nucleophiles the suppression of the autocatalytic route results from competition for the nitrous acid between the added halides and the thiocyanate anion, which is formed as a reaction product. Anal. of the kinetic data enabled extraction of the bimol. rate constants, k_NO⁺ = (3.2 ± 1.8) × 10¹⁰ M^-1 s^-1; k_NOSCN = (2.1 ± 0.2) × 10⁵ M^-1 s^-1; k_NOBr = (9.4 ± 0.2) × 10⁶ M^-1 s¹ and k_NOCl = (4.0 ± 0.2) × 10⁷ M^-1 s^-1, for the pathways catalyzed by SCN^–, Br^– and Cl^–, resp. Kinetic results are consistent with the attack on the nitrosating agent as the rate limiting step, i.e., the nitrosation of FDS behaves in a similar manner to the nitrosation of an amine. Rather different behavior is found for other substrates with an imino moiety adjacent to an amino nitrogen, such as the guanidines, which react by a mechanism in which the rate limiting step is the reorganization of the nitrosated substrate.

New Journal of Chemistry published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Application In Synthesis of 14807-75-1.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Malhotra, K. C. published the artcileOxidation of thiourea by N-bromosuccinimide. A kinetic study, Safety of Formamidine disulfide dihydrochloride, the publication is Journal of the Indian Chemical Society (1987), 64(9), 551-4, database is CAplus.

The kinetics of oxidation of thiourea (to formamidine disulfide) with NBS were studied. The oxidation is second order, first order each in thiourea and NBS. The rate increases with increase of pH and decrease of dielec. constant of the medium. The addition of NaCl and NaNO₃ electrolytes to the reaction mixture shows a neg. salt-effect.

Journal of the Indian Chemical Society published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Safety of Formamidine disulfide dihydrochloride.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Cumming, W. published the artcileControl of chromophore length in electroluminescent polymers. Part II. Mainchain polymers, COA of Formula: C15H24O2, the publication is Journal of Macromolecular Science, Pure and Applied Chemistry (1996), A33(9), 1301-1316, database is CAplus.

Electroluminescence emission has been demonstrated in mainchain polyesters and a structurally analogous polyamide. High-mol.-weight polyesters were synthesized by condensation of a dihydroxy-functionalized, substituted, phenylene vinylene analog, e.g., the lumophore, with a variety of dicarboxylic acid chlorides. The structure and hence the conjugation length of the emitting comonomer was predetermined prior to polymerization Since the diacid moieties did not contribute to the conjugation length and hence the emission wavelength, the structure of the diacid was determined on the basis of its ease of synthesis, reactivity, and solubilizing ability in the final polymer. In each of the polyesters, the electroluminescence wavelength of light-emitting diodes made from these polymers was similar to their photoluminescence emission spectrum in solution and the solid state at room temperature The emission wavelengths ranged from blue to green. The polyamide exhibits a very broad-band, nearly white electroluminescence. Diodes made from these polymers typically have external efficiencies �0.003% with low turn-on voltages, e.g., 6-20 V.

Journal of Macromolecular Science, Pure and Applied Chemistry published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, COA of Formula: C15H24O2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Kovacova, J. published the artcileComparison of redox transformations in platinum(IV) and copper(II) complexes with thiourea as ligand, Related Products of ethers-buliding-blocks, the publication is Chemicke Zvesti (1980), 34(2), 179-83, database is CAplus.

PtL₂Cl₄ and PtL’₂Cl₄ (L = N,N,N‘,N‘-tetramethylthiourea; L’ = N,N‘-ethylenethiourea) reacted with thiourea to give Pt(II) complexes. The possible course of substitution and redox processes was inferred indirectly from chem. changes and the reaction products. Differences in the redox changes of Pt(IV) and Cu(II) complexes after introduction of thiourea into the inner sphere are discussed on the basis of the mutual effect.

Chemicke Zvesti published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Related Products of ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Beyer, H. published the artcileThe formation of bisformamidine sulfides and isoureas, Category: ethers-buliding-blocks, the publication is Journal fuer Praktische Chemie (Leipzig) (1963), 20(5-6), 263-74, database is CAplus.

cf. CA 58, 2388d. RNHCSNH₂ (0.02 mole) and 0.01 mole R’₂NCN disolved in 15 ml. 5.6% absolute alc. HCl gave S[C(:NH)NHR]₂.2HCl (I) (all m.ps. with decomposition). In this way, SC(NH₂)₂ (II) with Et₂NCN (III), (CH₂:CHCH₂)₂NCN (IV), Bu₂NCN (V), PhNHCN, o-ClC₆H₄NHCN, p-MeC₆H₄NHCN, or BzNHCN (VI) gave 79, 85, 85, 47, 79, 52, or 74% I (R = H), m. 180°; MeNHCSNH₂ with III, IV, V, or MeNHCN gave 90, 90, 95, or 94% l (R = Me), m. 161°; EtNHCSNH₂ with III, IV, V, VI, or EtNHCN gave 57, 60, 69, 71, or 82% I (R = Et), m. 163°; CH₂:CHCH₂NHCSNH₂ with IV gave 55% I (R = CH₂:CHCH₂), m. 136-7°; PrNHCSNH₂ with IV gave 51% I (R = Pr), m. 156-7°; BuNHCSNH₂ with V gave 60% I (R = Bu), m. 147°; MeEtCHNHSNH₂ with IV or V gave 90% l (R = MeEtCH), m. 160-2°; PhCH₂NHCSNH₂ with IV, V, or PhCH₂NHCN gave 51, 54, or 81% I (R = PhCH₂), m. 179-81°; and PhCH₂CH₂NHCSNH₂ with IV or V gave 80 or 83% I (R = PhCH₂CH₂), m. 162-3°. (PhNH)₂CS and III in 15 ml. 5.6% alc. HCl gave 22% [PhNH(PhN:)Cl₂S.HCl, m. 248-51°; PhNHCSNH₂ and PhNHCN in 7.5 ml. 5.5% alc. HCl gave 72% [PhNH(HN:)Cl₂S.HCl, m. 147°; Et₂NCSNH₂ and III 4-5 weeks in alc. HCl gave 45% [Et₂N(HN:)Cl₂S.HCl, m. 139-40°. From the mother liquors of I from II with III, IV, or V, 31% Et₂NCSNH₂, m. 101-2°, 38% (CH₂:CHCH₂)₂NCSNH₂, or 38% Bu₂NCSNH₂, m. 58-9°, was isolated. Treating 0.02 mole VI with 0.02 mole PrOH, BuOH, MeEtCHOH, AmOH, or iso-AmOH (all containing HCl) gave 62% BzNHC(:NH)OR.HCl (VII) (R = Pr). m. 97° (free base m. 45°; picrate m. 140°], 86% VII (R = Bu) (VIII), m. 80° (free base 42°; yellow picrate m. 130-1°), 55% VII (R = MeEtCH) (IX), m. 104° (free base m. 54°; yellow picrate m. 136°), 83% VII (R = Am), m. 75° (free base m. 54°; picrate m. 131°), or 81% VII (R = iso-Am), m. 64° (yellow picrate m. 133°). Keeping a solution of 1.5 g. VI overnight in 15 ml. absolute alc. HCl gave 80% BzNHCONH₂ (X), m. 215°. Passing HCl gas into an equimol. mixture of p-MeC₆H₄CONHCN and PrOH and keeping overnight yielded 78% p-MeC₆H₁CONHCONH₂, m. 232°, and 51% PrCl. Heating 2.2 g. IX in 10 ml. 8.2% HBr in dioxane gave 91% BzNHCONH₂ and MetEtCHBr, identified via the S-isobutylisothiuronium picrate, m. 167°. Refluxing 11 g. VIII with AcOH gave 48% AcOBu, b. 125-6°. H₂NCN and Et₂NCONH₂ did not reach in the presence of HCl. VII also were split by HBr and HI, giving the corresponding alkyl halides.

Journal fuer Praktische Chemie (Leipzig) published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Category: ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Murthy, A. V. R. published the artcileProbing the Role of Chain Length on the Diffusion Dynamics of π-Conjugated Polymers by Fluorescence Correlation Spectroscopy, Application In Synthesis of 146370-51-6, the publication is Journal of Physical Chemistry B (2011), 115(37), 10779-10788, database is CAplus and MEDLINE.

We investigate the role of the chain length and mol. weight distribution on the diffusion dynamics of freshly synthesized MEH-PPV polymer chains. For the above purpose, a new technique based on combination of size exclusion chromatog. (SEC) with fluorescence correlation spectroscopy (FCS) is developed to probe the diffusion dynamics of a narrow mol. weight distribution of fractionated samples of 20-500 kDa. The narrow dispersed samples were characterized by absorbance, emission, and time-resolved fluorescence decay techniques. The results revealed that the properties of fractionated samples were almost uniform for a wide range of mol. weights A maximum entropy based method for FCS data anal. is employed to obtain the correct diffusion coefficients of the polymer chains with heterogeneous dynamics. The FCS experiment on the unfractionated broad mol. weight sample is not enough to establish the correlation between the mol. weight of the chains with diffusion dynamics and emphasized the need for relatively monodispersed π-conjugated polymers. FCS results show that higher mol. weight chains diffuse much faster than shorter ones. Atomic force microscopy revealed that 300 kDa polymers produced 130 nm particles, whereas 50 kDa polymer chains formed micrometer size aggregates. At higher mol. weights, the strong chain interactions promote the formation of globular (or tightly packed) particles which diffuse faster in solution The low mol. weight chains experience strong interparticle interaction; as a consequence, the diffusion of chains becomes slower. In the present investigation, we demonstrate the need for the narrow polydisperse sample for establishing the correlation between diffusion dynamics and chain length (or mol. weights) of π-conjugated polymers using a single mol. spectroscopy technique such as FCS.

Journal of Physical Chemistry B published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Application In Synthesis of 146370-51-6.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Tydlitat, Jiri published the artcileInfluence of Donor-Substituents on Triphenylamine Chromophores Bearing Pyridine Fragments, Quality Control of 596819-12-4, the publication is European Journal of Organic Chemistry (2019), 2019(9), 1921-1930, database is CAplus.

Efficient synthetic routes that combine different palladium-catalyzed cross-coupling reactions were developed for the preparation of a new family of push-pull derivatives in which pyridine was used as the acceptor group and different para-substituted diphenylamines as the donor groups. All compounds showed absorption in the UV/visible region and blue-green emission with high quantum yields. Significant red shifts were observed in the absorption and fluorescence emission maxima on increasing the electron-donating ability of the substituents or on incorporating a π-conjugated linker. This finding can be explained on the basis of enhanced intramol. charge transfer (ICT). Strong emission solvatochromism confirmed the formation of an intramol. charge-separated emitting state. The HOMO-LUMO energy gaps were estimated by exptl. electrochem. measurements and the results were interpreted with the aid of DFT calculations The thermal behavior of all materials also was studied by DSC.

European Journal of Organic Chemistry published new progress about 596819-12-4. 596819-12-4 belongs to ethers-buliding-blocks, auxiliary class Thiophene,Boronic acid and ester,Ether,Boronate Esters,Boronic acid and ester, name is 2-(5-Methoxythiophen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C3H6BrNaO3S, Quality Control of 596819-12-4.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem