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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Infrared spectroscopic study of the condensation of iodofurfural bromofurfural with ketones. II》. Authors are Usmanov, Z.; Tadzhieva, M.; Kamenskii, I. V.; Khidoyatov, A..The article about the compound:5-Iodo-2-furaldehydecas:2689-65-8,SMILESS:IC1=CC=C(O1)C=O).Formula: C5H3IO2. Through the article, more information about this compound (cas:2689-65-8) is conveyed.

cf. CA 61, 9373a. The condensation products of iodofurfural with allylacetone, Me2CO, and CH2Ac2, and of bromofurfural with (CH2)2Ac2 were prepared and their ir spectra given. The products were obtained in the presence of EtOH and NaOH without heating. They are soluble in organic solvents. The spectra and elemental analyses show that the products are individual compounds with conjugated C:C and C:O bonds. They can be used as catalysts in the synthesis of thermoreactive polymers on the basis of furfural, furfurylidenealdehydes, furfurylidene ketones, and their fusible products.

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1,8-Naphthyridine – Wikipedia,
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Category: naphthyridine. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5-Iodo-2-furaldehyde, is researched, Molecular C5H3IO2, CAS is 2689-65-8, about Studies on furopyridines. VI. Synthesis and stereostructure of hetarylmethylene-3-oxo-4-thiofuro[3,4-c]pyridines. Author is Kaigorodova, E.A.; Kvak, S. N.; Ugrak, B. I.; Zaplishnyi, V. N.; Kul’nevich, V. G..

Condensation reaction of 6-methyl-3-oxo-4-thio-1H-furo[3,4-c]pyridine with heteroaromatic aldehydes proceeds regioselectively at the methylene center to give Z isomers of title compounds I (R = H, Z = O, S; R = Me, Br, iodo, Z = O) in s-cis conformations for furfuryl and in s-trans conformations for thenylmethylene derivatives

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COA of Formula: C5H3IO2. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Iodo-2-furaldehyde, is researched, Molecular C5H3IO2, CAS is 2689-65-8, about Comparative study by mass spectrometry of the fragmentation of 5-substituted furfurals. Author is Lauzardo, N.; Mocelo, R.; Padron, G.; Buttner, J.; Fanghaner, F..

A comparative study on the fragmentation of a series of 5-substituted furfurals (X = H, CH3, Cl, Br, I, NO2, COOCH3, COOH) was made. Depending on the nature of the substituent, 2 main pathways of fragmentation were observed One of them starts with the fragmentation of the aldehyde group (X = H, CH3, Cl, Br, I). The other starts with the fragmentation of substituents (X = NO2, COOCH3, COOH). The spectra are discussed on the basis of these 2 fragmentation pathways.

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Reference:
1,8-Naphthyridine – Wikipedia,
1,8-Naphthyridine | C8H6N2 – PubChem

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 Synthesis and spectral properties of 2-(5-R-2-furylmethylene)-3-oxobutanenitriles, published in 1993-06-30, which mentions a compound: 2689-65-8, Name is 5-Iodo-2-furaldehyde, Molecular C5H3IO2, Application In Synthesis of 5-Iodo-2-furaldehyde.

Substituted 2-(5-R-2-furylmethylene)-3-oxobutanenitriles I (R = H, halo, Ph, etc.) were obtained by condensation of the corresponding 5-R-2-furaldehydes II with 3-amino-2-butenenitrile in acid medium. Relation between the structure and spectral properties (NMR, IR, UV, MS) is presented and the influence of substituents in position 5 of the furan ring on the conjugated 2-furylethylene system is discussed.

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1,8-Naphthyridine – Wikipedia,
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Synthetic Route of C5H3IO2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 5-Iodo-2-furaldehyde, is researched, Molecular C5H3IO2, CAS is 2689-65-8, about Study of copper, nickel, and zinc electroplating in the presence of some furaldehydes. Author is Kuznetsov, V. V.; Grigor’ev, V. P.; Fadeeva, O. V.; Nazarova, Z. N..

On the basis of the linearity principle of free energies, a quant. evaluation was made of the effect of the structure of furfural derivatives (I; R = H, Cl, I, Br, CHO, Ph, Me, OMe, Et2N, Me2N) on the kinetics of electroplating of Cu, Ni, and Zn. A correlation was established between electrochem., adsorption,and spectral characteristics of the studied furaldehydes and the substituent constants of their mols.

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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 5-Iodo-2-furaldehyde(SMILESS: IC1=CC=C(O1)C=O,cas:2689-65-8) is researched.Recommanded Product: Picolinamide. The article 《Determination of NH2 concentration on 3-aminopropyl tri-ethoxy silane layers and cyclopropylamine plasma polymers by liquid-phase derivatization with 5-iodo 2-furaldehyde》 in relation to this compound, is published in Applied Surface Science. Let’s take a look at the latest research on this compound (cas:2689-65-8).

The quantification of concentration of primary amines, e.g. in plasma polymerized layers, is a very important task for surface anal. However, the commonly used procedure, such as gas phase derivatization with benzaldehydes, shows several drawbacks, the most important of which are the side reaction effects. The authors propose and validate a liquid phase derivatization using 5-iodo 2-furaldehyde (IFA). The content of NH2 groups can be determined from the at. concentrations measured by XPS, in particular from the ratio of I 3d and N 1s peak intensities. First, the authors demonstrate the method on a prototypical system such as 3-aminopropyl tri-ethoxy silane (APTES) layer. Here the XPS anal. carried out after reaction of APTES layer with IFA gives the fraction of primary amines (NH2/N) of 38.3 ± 7.9%. Comparing this value with that obtained by N 1s curve fitting of APTES layer giving 40.9 ± 9.5% of amine groups, all primary amines were derivatized by reaction with IFA. The second system to demonstrate the method comprises cyclopropylamine (CPA) plasma polymers that were free from conjugated imines. In this case the method gives the NH2 fraction ∼8.5%. This value is closely matching the NH2/N ratio estimated by 4-trifluoromethyl benzaldehyde (TFBA) derivatization. The reaction of IFA with CPA plasma polymer exhibiting high d. of conjugated imines revealed the NH2/N fraction of ∼10.8%. This value was significantly lower compared to 17.3% estimated by TFBA derivatization. As the overestimated d. of primary amines measured by TFBA derivatization is probably related to the side reaction of benzaldehydes with conjugated imines, the proposed IFA derivatization of primary amines can be an alternative procedure for the quantification of surface amine groups.

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D’Auria, Maurizio; De Mico, Antonella; D’Onofrio, Franco published the article 《An unusual photochemical reaction of indene with furan and thiophene derivatives》. Keywords: photochem substitution reaction halofuran halothiophene; furan indenyl; thiophene indenyl; iodofuran iodothiophene photochem substitution reaction.They researched the compound: 5-Iodo-2-furaldehyde( cas:2689-65-8 ).Electric Literature of C5H3IO2. 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:2689-65-8) here.

Photochem. substitution of iododfurans or iodothiophenes by indene gave 2-indenylfurans or -thiophenes. E.g., irradiation of 5-iodofuran-2-carboxaldehyde in MeCN in the presence of indene gave the substitution product I.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Dipole moments of some furfural derivatives》. Authors are Kova-lenko, K. N.; Minkin, V. I.; Nazarova, Z. N.; Kazachenko, D. V..The article about the compound:5-Iodo-2-furaldehydecas:2689-65-8,SMILESS:IC1=CC=C(O1)C=O).COA of Formula: C5H3IO2. Through the article, more information about this compound (cas:2689-65-8) is conveyed.

The following values of dipole moments (in D.) were determined from the dielec. data in C6H6 at 25°: furfural 3.56; 5-bromofurfural 3.37; 5-iodofurfural 3.29; 5-chiorofurfural 3.37; 5-nitrofurfural 3.46; 5-nitrofurfurylidene diacetate 4.26; the following values were found in dioxane: furfural 3.6, 5-iodofurrural 3.39. The results indicate that free rotation of the CHO group in furfural and its 5-halo derivatives is restricted and the mols. exist mainly in a conformation with the CHO-oxygen atom disposed toward the ring O atom.

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1,8-Naphthyridine – Wikipedia,
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In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis based on formylfuro(2,3-b) benzothiachromone, published in 1974, which mentions a compound: 2689-65-8, mainly applied to furobenzothiachromone, Safety of 5-Iodo-2-furaldehyde.

ο[(5-Formyl-2-furyl)thio]-benzoic acid, obtained from reaction of ο-mercaptobenzoic acid with 5-iodofurfural, cyclized (polyphosphoric acid) to give the furobenzothiachromone I (R = CHO), which when treated with HONH2 gave I (R = CH:NOH). The latter was converted (Ac2O) to the nitrile I (R = CN), hydrolysis (polyphosphoric acid) of which gave the expected amide I (R = CONH2).

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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, Heterocycles called An unusual photochemical reaction of indene with furan and thiophene derivatives, Author is D’Auria, Maurizio; De Mico, Antonella; D’Onofrio, Franco, which mentions a compound: 2689-65-8, SMILESS is IC1=CC=C(O1)C=O, Molecular C5H3IO2, SDS of cas: 2689-65-8.

Photochem. substitution of iododfurans or iodothiophenes by indene gave 2-indenylfurans or -thiophenes. E.g., irradiation of 5-iodofuran-2-carboxaldehyde in MeCN in the presence of indene gave the substitution product I.

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1,8-Naphthyridine – Wikipedia,
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