Category: chiral-oxygen-ligands

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Stereochemical investigations of 1,4-substituted cyclohexane derivatives. 4-Hydroxy- and 4-aminocyclohexane-1-carboxylic acid and their esters; and 4-hydroxy-1-hydroxymethylcyclohexane》. Authors are Schneider, Woldemar; Huettermann, A..The article about the compound:cis-4-Aminocyclohexane carboxylic acidcas:3685-23-2,SMILESS:N[C@H]1CC[C@H](CC1)C(O)=O).Quality Control of cis-4-Aminocyclohexane carboxylic acid. Through the article, more information about this compound (cas:3685-23-2) is conveyed.

Malonic ester synthesis with ethyl β-chloropropionate, followed by ring closure of the product obtained gave 4-hydroxy-1-cyclohexanone (I). Hydrogenation of I (Raney-Ni, atm. pressure, room temperature) in alk. medium gave cis-4-hydroxycyclohexane-1-carboxylic acid (cis-II), m. 152°; Et ester, (cis-III) b12 130°. Hydrogenation of ethyl 4-hydroxybenzoic acid (Raney-Ni, 150 atm., 150°) gave trans-III, b13 139-140°, saponification of which gave the trans-II, m. 119.5°. Reduction of trans-III with Na-EtOH or LiAlH4, gave a cis-trans mixture of 4-hydroxy-1-hydroxymethylcyclohexane (IV), from which the trans isomer (V) was separated, m. 104°; the cis isomer (VI) was recovered by distillation from the residue. Hydrogenation of ethyl 4-aminobenzoic acid (Ru-C, 110 atm., 80°) gave a cis-trans mixture of 4-amino-1-carbethoxycyclohexane (VII), which was separated by distillation, giving cis-VII and trans-VII. The exptl. determined dipole moments (μ in Debye units) of these compounds are: cis-II 2.10 ± 0.1, trans-II 246 ± 0.002, cis-III 2.86 ± 0.03, trans-III 2.56 ± 0.04, VI 2.29 ± 0.02, V 2.60 ± 0.1, cis-VII 2.60 ± 0.01, and trans-VII 2.44 ± 0.02.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 3-Methyl-1H-pyrrole, is researched, Molecular C5H7N, CAS is 616-43-3, about Modulation of coffee aroma via the fermentation of green coffee beans with Rhizopus oligosporus: II. Effects of different roast levels.Recommanded Product: 616-43-3.

This study aims to evaluate how changes of the volatile and non-volatile profiles of green coffees induced by Rhizopus oligosporus fermentation of green coffee beans (Part I) translated to changes in the volatile and aroma profiles of light, medium and dark roasted coffees and non-volatile profile of roasted coffee where fermentation effects were most distinctive (light roast). R. oligosporus fermentation resulted in 1.7-, 1.5- and 1.3-fold increases in pyrazine, 2-methylpyrazine and 2-ethylpyrazine levels in coffees of all roast degrees, resp. This corresponded with the greater extent of amino acids degradation in light roasted fermented coffee. Et palmitate was detected exclusively in medium and dark roasted fermented coffees. The sweet attribute of light and dark roasted coffees were increased following fermentation along with other aroma profile changes that were roast degree specific. This work aims to develop a direct but novel methodol. for coffee aroma modulation through green coffee beans fermentation

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

HPLC of Formula: 3685-23-2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: cis-4-Aminocyclohexane carboxylic acid, is researched, Molecular C7H13NO2, CAS is 3685-23-2, about Liquid-phase hydrogenation of some aromatic acids on ruthenium catalysts. Author is Ponomarev, A. A.; Ryzhenko, L. M.; Smirnova, N. S..

Using 10% RuO2 or Ru on activated the hydrogenation was carried out at 100-20° in H2O or in aqueous alk. solutions The following compounds gave 60-99% yields of the following products (starting compound and product given): p-H2NC6H4CO2H, p-aminohexa-hydrobenzoic acid (I); p-O2NC6H4CO2H, I; m-H2NC6H4CO2H, m-aminohexahydrobenzoic acid (II), m-O2NC6H4CO2H, II; m-NaOC6H4CO2Na, m-hydroxyhexahydrobenzoic acid; disodium 2-methylterephthalate, 2-methylhexahydroterephthalic acid.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Electric Literature of C5H7N. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 3-Methyl-1H-pyrrole, is researched, Molecular C5H7N, CAS is 616-43-3, about Model reactions on roast aroma formation. III. Mass spectrometric identification of pyrroles from the reaction of serine and threonine with sucrose under the conditions of coffee roasting. Author is Baltes, Werner; Bochmann, Gloria.

Numerous alkyl- and acylpyrroles, two 2,3-dihydro[1H]pyrrolizines, furfurylpyrroles, and 1 furanylpyrrole were identified in the volatiles of roasting serine, threonine, and sucrose. The formation of the alkylpyrroles was suggested to proceed via a pyrolytic pathway because they were formed in the absence of sucrose. The retention indexes and mass spectra are reported together with selected mass spectrometric fragmentations. A large number of the identified compounds were also recognized in roast coffee volatiles.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

HPLC of Formula: 616-43-3. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 3-Methyl-1H-pyrrole, is researched, Molecular C5H7N, CAS is 616-43-3, about Optimised coagulation using aluminium sulfate for the removal of dissolved organic carbon. Author is Chow, Christopher W. K.; van Leeuwen, John A.; Fabris, Rolando; Drikas, Mary.

Coagulation experiments at pH values ranging from 3 to 7 were conducted on raw water samples from four Australian reservoirs-Hope Valley, Myponga, Moorabool and Mt Zero-to assess the removal of natural organic matter (NOM) with alum. The aim was to characterize the NOM in these water sources that is highly recalcitrant to removal by alum coagulation. The selection of these water sources covered a range in raw water quality varying in inorganic and organic composition and character. NOM in both raw and treated waters was characterized by several techniques including specific UV absorbance (SUVA), high performance size exclusion chromatog. (HPSEC) and pyrolysis-gas chromatog. mass spectrometry (Py-GC-MS). The results can provide better understanding of the removal limitations of each treatment step and the knowledge will allow design engineers to select a suitable combined treatment process for optimum NOM removal. Despite the fact that the organic character of the four source waters were different, results showed that after optimized alum coagulation all four waters had a similar character. The mol. weight distribution anal. (HPSEC) indicated alum coagulation preferentially removed the higher mol. weight UV absorbing compounds while those remaining in the treated waters had the properties of lower apparent mol. weights (about 500-700 Daltons) and less UV absorbance. Py-GC-MS analyses of NOM in these waters before and after treatment indicated that polysaccharides and their derivatives are recalcitrant to removal with alum coagulation. Generally, the findings indicate that the character of the NOM is an important factor in determining its treatability.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile, is researched, Molecular C6Cl2N4, CAS is 56413-95-7, about The role of the size of aza-crown recognition moiety in azaphthalocyanine fluorescence sensors for alkali and alkaline earth metal cations.SDS of cas: 56413-95-7.

A series of fluorescence sensors bearing one 1-aza-12-crown-4, 1-aza-15-crown-5, 1-aza-18-crown-6 or 1-aza-21-crown-7 as a recognition moiety and an aza-analog of phthalocyanine as a fluorophore was prepared All compounds absorbed and emitted light in the red region. Sensing properties based on intramol. charge transfer were studied via absorption and fluorescence titration experiments with alkali metal cations and alk. earth metal cations. Important relationships between aza-crown size and binding affinity were observed in the group of alkali metal cations. Affinity for lithium decreased in series from the smallest crown to the largest, 1-aza-15-crown-5 bound sodium and potassium similarly, and 1-aza-18-crown-6 had the highest affinity to potassium. Alk. earth metal cations were bound more tightly, which was obvious from more pronounced changes in the absorption spectra, and from the higher increase of fluorescence upon cation addition A limited size preference was observed in the group of alk. earth metal cations.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Related Products of 56413-95-7. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile, is researched, Molecular C6Cl2N4, CAS is 56413-95-7, about Reaction of 2,3-dichloro-5,6-dicyanopyrazine with amines.

Reaction of 2,3-dichloro-5,6-dicyanopyrazine (I) with amines gave mono-substituted or bis-substituted products (II; R1 = NH2, NHMe, NEt2, NMe2, pyrrolidino, morpholino; R2 = Cl, NH2, NHMe, NEt2, NHBu). Reaction if I with thioacetamide or 2,3-bis(N-methylamino)-5,6-dicyanopyrazine gave 1,4,6,9-tetraaza-2,3,7,8-tetracyanothianthrene or 2,3,7,8-tetracyano-1,4,6,9-tetraaza-5,10-dimethyl-5,10-dihydrophenazine, resp. Nonlinear optical properties for II as well as biol. activity of 2-[2-(diethylamino)vinyl]-3-chloro-5,6-dicyanopyrazine were evaluated.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Recommanded Product: 616-43-3. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 3-Methyl-1H-pyrrole, is researched, Molecular C5H7N, CAS is 616-43-3, about Selective production of pyrroles via catalytic fast pyrolysis of cellulose under ammonia atmosphere at low temperature.

In this study, cellulose was selectively converted into pyrroles via catalytic fast pyrolysis under ammonia atm. over the γ-Al2O3 catalyst. Both in situ and ex situ lab-scale fast pyrolysis sets were designed and used for investigation, and more pyrroles were produced via in situ CFP process. In addition, the effects of catalyst, reaction temperature and catalyst-to-cellulose ratio on the product distribution were investigated systematically. All these factors played important roles in the production of pyrroles. Under the optimized in situ CFP condition, at 400°C and catalyst-to-cellulose ratio at 2, the carbon yield of N-containing chems. from cellulose under ammonia atm. reached 9.7%. The selectivity of pyrroles in N-containing chems. was 89.5%. The possible conversion pathway from cellulose to pyrroles was also proposed, i.e., cellulose was firstly converted into anhydrosugars through thermal decomposition, then anhydrosugars underwent dehydration and rearrangement reactions to form furans. Thereafter, the furans were transformed into pyrroles by reacting with ammonia.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Doklady Akademii Nauk SSSR called Photoionization and electron structure of pyrrole and methylpyrroles, Author is Potapov, V. K.; Yuzhakova, O. A., which mentions a compound: 616-43-3, SMILESS is CC1=CNC=C1, Molecular C5H7N, Recommanded Product: 616-43-3.

The appearance potentials were tabulated along with the ionic form for pyrrole, its 1-Me, 1-Bu, 2-Me, 3-Me and 2,4-di-Me analogs, from mass spectrometric data and from photoionization plots. The peculiarity of all these compounds was the existence of sharp rises of ionization thresholds which determine the position of the electronic 0-0 transition corresponding to the 1st adiabatic ionization potential of the mol. The 1st ionization potential of pyrrole is 8.2 ev, which corresponds to electron removal from the upper mol. 1a2 π3 orbital which has a node at the N atom and maximum electron d. at C atoms adjacent to N. The 2nd ionization potential of 9.08 eV corresponds to electron removal from the 2b1 π2 orbital which has maximum electron d. at C atoms not connected to N and a min. at C atoms which are connected to N. The variations of these values with alteration of structure are briefly discussed.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Product Details of 56413-95-7. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile, is researched, Molecular C6Cl2N4, CAS is 56413-95-7, about Synthesis and solution studies on azaphthalocyanines with quaternary aminoethyl substituents.

A pyrazinedinitrile derivative carrying dimethylaminoethylsulfanyl groups at positions 5 and 6 was synthesized from 2-dimethylaminoethanethiol hydrochloride and 2,3-dicarbonitrile-5,6-dichloropyrazine. The dicarbonitrile gave magnesium azaphthalocyanine (MgAzaPc) when reacted with magnesium propoxide in propanol. The conversion of the MgAzaPc to a metal-free derivative was achieved by treatment with trifluoroacetic acid. Incorporation of transition metal ions into the inner core of azaphthalocyanine was accomplished by treatment of the metal-free derivative with metal acetates, i.e. Zn(OAc)2, Co(OAc)2. These azaphthalocyanines were converted into water-soluble quaternised products by reaction with Me iodide. Aggregation phenomena were followed for magnesium azaphthalocyanine with quaternisable dimethylamino substituents within a specific range of pH. The compounds were characterized by FTIR, 1H NMR, mass and UV-visible spectral data.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate