Tag: M.W:100-200

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Reactions of furan compounds. IV. High-temperature decomposition of the vapors of tetrahydrofuronitrile and Me tetrahydrofuroate to give 2,3-dihydrofuran and cyclopropanealdehyde》. Authors are Wilson, Christopher L..The article about the compound:Methyl tetrahydrofuran-2-carboxylatecas:37443-42-8,SMILESS:O=C(C1OCCC1)OC).Safety of Methyl tetrahydrofuran-2-carboxylate. Through the article, more information about this compound (cas:37443-42-8) is conveyed.

Tetrahydrofuramide (I) is not dehydrated by COCl2 at high temperatures At 360-400° over silica gel, I gives a mixture of tetrahydrofuronitrile (II) and 2,3-dihydrofuran (III), together with some HCN; the yield of II at 290° was 74%, at 310° 55%, and at 330° 40% (yields are based on consumption, see Part III); over Na phosphate (pumice impregnated with 120 g. NaH2PO4 and 15 cc. H3PO4 in 85 cc. H2O and dried by heating slowly to 300°) at 400° the yield of II was 90%, consumption of I 50-85%. With N as carrier gas (2 l./hr.), 70% of II was recovered when passed over earthenware rings at 450°; 10% was impure III. Silica gel at 500° gives 20% of tetrahydrofuran (IV)-III mixture (48% of III), 10% of unchanged II and 10% of a compound (V), which may be CH2.CH2.C:CHCN, b. 130-40°. Na phosphate at 500° gives HCN, only a little III + IV and mainly cyclopropanecarboxaldehyde (VI), b14 42-4°; 2,4-dinitrophenylhydrazone, orange-red, m. 173-5°; p-nitrophenylhydrazone, golden-yellow, m. 129-32°; dimedon derivative, m. 160-2°. NH4 tetrahydrofuroate (aqueous solution containing an excess of NH3) over earthenware rings gives an equimol. mixture of the free acid and I; over silica gel at 500-600° V and II were formed; over Na phosphate, the temperature and carrier gas (N, CO2) appeared to have little influence on the results; between 450-550° there resulted 20-30% of a product b. 45-90° containing MeOH, III, and VI; over silica gel at 375°, the products were III and PrCHO (2,4-dinitrophenylhydrazone, orange-brown, m. 120-5°); at 400°, the ester gives 30% of a liquid containing some III and VI. VI was prepared in about 20% yield from Cl(CH2)3CN and SnCl2 in ether (saturated with HCl).

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Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

Formula: C8H12O4. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: cis-Cyclohexane-1,2-dicarboxylic acid, is researched, Molecular C8H12O4, CAS is 610-09-3, about Potassium selectivities of bis(benzo-15-crown-5) derivatives obtained from cyclohexanedicarboxylic acids. Author is Kimura, Keiichi; Ishikawa, Atsuo; Tamura, Hiroshi; Shono, Toshiyuki.

Several bis(benzo-15-crown-5) derivatives containing a cyclohexane or benzene ring in the bridge chain were synthesized as neutral carriers of coated-wire K+-selective electrodes. The bis(benzocrown ether) derivative obtained from cis-1,2-cyclohexanedicarboxylic acid was outstandingly K-selective.

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Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 3326-71-4, is researched, Molecular C5H6N2O2, about Photophysics of proton transfer in hydrazides: a combined theoretical and experimental analysis towards OLED device application, the main research direction is hydrazide preparation proton transfer IR UV spectra electrophotoluminescence.SDS of cas: 3326-71-4.

Hydrazides generate phototautomers and thus, a mechanistic interpretation to uncover the excited state dynamics of such systems is highly necessary to theorize principles based on exptl. speculations. Accordingly, focus on the proton transfer barrier, which is a questionable step-wise or hypothetical simultaneous double proton transfer on structurally favored species, is quintessential; however, to the best of our knowledge, theor. insights into such findings remain rare. Thus, TX, PX and FX (where X = 2 and 3) were designed and synthesized by incorporating hydrazides, which exhibit the phenomenon of excited state intramol. proton transfer (ESIPT). Some of the mols. exhibited electroluminescence when employed as an active emitter material in fabricated OLED devices. Theor. predictions support the presence of extended conjugation in TX, PX and FX (where X = 2 and 3) to support ESIPT efficiently in comparison with TX, PX and FX (where X = 1). The solvatochromic study revealed that TX, PX and FX (where X = 2 and 3) exhibit a distinct double peak in THF solvent, characteristic of ESIPT. Interestingly, for some of the mols., emission in thin film form showed a double peak, which indicates ESIPT in the solid state. However, it was found that aggregation induced emission (AIE) was inactive in these mols. The geometrical attributes of the mols. and the nature of electronic orbital distribution well underline the principle supporting excited state proton translocation. The theor. estimated energy transitions exhibited good correlation with the exptl. results. Also, the potential energy scans revealed the mols. possess a lower forward barrier at their excited state in comparison with that of their ground state, promoting ESIPT. The potential energy surface scans performed on structurally favored species confirmed the impossible double proton transfer and highly difficult step-wise double proton transfer.

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

Feng, Ze Wang; Zhao, Xin Qi; Bi, Hua published the article 《Selective esterification of non-conjugated carboxylic acids in the presence of conjugated or aromatic carboxylic acids over active carbon supported methanesulfonic acid》. Keywords: carboxylic acid nonconjugated selective esterification conjugated aromatic carboxylic acid; ester preparation active carbon supported methanesulfonic acid catalyst.They researched the compound: Methyl tetrahydrofuran-2-carboxylate( cas:37443-42-8 ).Product Details of 37443-42-8. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:37443-42-8) here.

Non-conjugated carboxylic acids are selectively esterified in good yields in the presence of conjugated or aromatic carboxylic acids by stirring over active carbon supported methanesulfonic acid in dichloromethane at room temperature

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

Quality Control of 2-Furoic hydrazide. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-Furoic hydrazide, is researched, Molecular C5H6N2O2, CAS is 3326-71-4, about Catalyst-free, aza-Michael polymerization of hydrazides: polymerizability, kinetics, and mechanistic origin of an α-effect. Author is Love, Dillon; Kim, Kangmin; Domaille, Dylan W.; Williams, Olivia; Stansbury, Jeffrey; Musgrave, Charles; Bowman, Christopher.

Despite the powerful nature of the aza-Michael reaction for generating C-N linkages and bioactive moieties, the bis-Michael addition of 1° amines remains ineffective for the synthesis of functional, step-growth polymers due to the drastic reduction in reactivity of the resulting 2° amine mono-addition adduct. In this study, a wide range of com. hydrazides are shown to effectively undergo the bis-Michael reaction with divinyl sulfone (DVS) and 1,6-hexanediol diacrylate (HDA) under catalyst-free, thermal conditions to afford moderate to high mol. weight polymers with Mn = 3.8-34.5 kg mol-1. The hydrazide-Michael reactions exhibit two distinctive, conversion-dependent kinetic regimes that are 2nd-order overall, in contrast to the 3rd-order nature of amines previously reported. The mono-addition rate constant was found to be 37-fold greater than that of the bis-addition at 80°C for the reaction between benzhydrazide and DVS. A significant majority (12 of 15) of the hydrazide derivatives used here show excellent bis-Michael reactivity and achieve >97% conversions after 5 days. This behavior is consistent with calculations that show minimal variance of electron d. on the N-nucleophile among the derivatives studied. Reactivity differences between hydrazides and hexylamine are also explored. Overall, the difference in reactivity between hydrazides and amines is attributed to the adjacent nitrogen atom in hydrazides that acts as an efficient hydrogen-bond donor that facilitates intramol. proton-transfer following the formation of the zwitterion intermediate. This effect not only activates the Michael acceptor but also coordinates with addnl. Michael acceptors to form an intermol. reactant complex.

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 37443-42-8, is researched, Molecular C6H10O3, about Preparation of γ-butyrolactones by the oxidation of monofunctional derivatives of tetrahydrofuran, the main research direction is furfuryl alc oxidation; furan alc ester oxidation; lactone aliphatic; butyrolactone acyloxy hydroxy.Quality Control of Methyl tetrahydrofuran-2-carboxylate.

Liquid phase oxidation of tetrahydrofurfuryl alc., its formate and acetate, and Me 2-tetrahydrofurancarboxylate, largely at 115°, in 10-25 hr in a flow-type glass reactor gave good yields of γ-butyrolactone or its γ-CH2OH, CH2O2CH, CH2OAc or CO2Me derivatives, resp., HCO2H and succinic acid. Evidently the oxidation occurred at the C2 and C5 positions. Uv light promoted the reaction and allowed its operation at lower temperature The summary yields of the lactones were 72-95%. The last substrate above was oxidized in the presence of Mn(OAc)2.4H2O catalyst at 70°.

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Tin Powder-Promoted Cascade Condensation/Allylation/Lactamization: Synthesis of Isoindolinones and Pyrazoloisoindol-8-ones, published in 2019-06-07, which mentions a compound: 3326-71-4, Name is 2-Furoic hydrazide, Molecular C5H6N2O2, Category: benzisoxazole.

An efficient tin powder-promoted cascade condensation/allylation/lactamization of 2-formylbenzoic acids, hydrazides, and allyl bromides was developed for the synthesis of isoindolinones in good to excellent yields under mild conditions without any other additives or catalysts. Further manipulation of isoindolinones by iodocyclization process afforded the tricyclic tetrahydro-8H-pyrazolo[5,1-a]isoindol-8-one derivatives, which could be converted into more complicated tetracyclic tetrahydro-4H-azirino[1′,2′:2,3]pyrazolo[5,1-a]isoindol-4-ones.

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

Recommanded Product: 2-Furoic hydrazide. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-Furoic hydrazide, is researched, Molecular C5H6N2O2, CAS is 3326-71-4, about Catalytic oxidation of benzyl-alcohol with H2O2 in the presence of a dioxidomolybdenum(VI) complex. Author is Balapoor, Leila; Bikas, Rahman; Dargahi, Maryam.

A new dioxidomolybdenum(VI) complex, [MoO2(L)(CH3OH)] (1), was synthesized by the reaction of MoO3 with ONO-donor hydrazone ligand that was obtained from the condensation of benzolyacetone and furan-2-carbohydrazide in methanol. Both of the ligand and complex were characterized by elemental anal. and FTIR, NMR and UV-visible spectroscopic methods. The structure of complex was also determined by single crystal x-ray anal. Structural anal. showed that the Mo(VI) ion has a distorted octahedral geometry and the ligand is coordinated to the metal ion as dineg. ONO-donor ligand. The obtained molybdenum(VI) complex was used as catalyst in oxidation of benzyl alc. with H2O2 as a green oxidant. The effects of some parameters such as temperature, solvent and ratio of materials were also studied. Catalytic studies indicated that complex 1 can efficiently catalyze the oxidation of benzyl alc. but its activity and selectivity are considerably dependent on the reaction condition.

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

Sandeep, Thummar; Vasishta, Bhatt published an article about the compound: 2-Furoic hydrazide( cas:3326-71-4,SMILESS:O=C(C1=CC=CO1)NN ).Reference of 2-Furoic hydrazide. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:3326-71-4) through the article.

A series of (((oxadiazolyl-thio)(nitrophenyl-amino)pyrimidinyl)hydrazinyl)-N-phenylacetamide motifs I [R = Ph, 2-furyl, 3-pyridyl, etc.] was synthesized and studied for their antibacterial and antifungal activities as well as for mol. docking and FMO studies. All the synthesized mols. were characterized by 1H NMR and 13C NMR spectroscopic anal. Compounds I [R = 3-pyridyl, 4-pyridyl] were found to be potentially active against gram neg. and gram-pos. bacteria with MIC value between 62.5 to 500μg/mL. The mol. docking studies of compounds I [R = Ph, 3-pyridyl] were further carried out to discover the interaction with active sites.

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 3326-71-4, is researched, Molecular C5H6N2O2, about Synthesis of acylhydrazone based fluorescent probe for Al (III) and its property, the main research direction is acylhydrazone fluorescent probe aluminum fluorometry.SDS of cas: 3326-71-4.

An acylhydrazone based fluorescent probe was synthesized by two-step reaction with tetrakis(bromomethyl) benzene and 2,4-dihyoxybenzaldehyde as raw materials. The compound showed excellent selectivity for Al3+ in the V(DMSO):V (H2O) = 19:1 solution, showing remarkable fluorescence enhancement effects towards Al3+ at the emission wavelength of 446 nm. The stoichiometry of 1:2 of the Al (III) complexes was determined by Job’s plots, 1HNMR titration experiments and LC-MS anal. The spectroscopic titration indicated that the detection limits of the probe for Al3+ were 1.16 × 10-7 mol/L and the complexing constant of the probe to Al3+ was 2.28 × 10-3 L/mol. Furthermore, the probe can be used for the determination of Al3+ in the river water and tap water samples.

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics