Heterocycles with Sulphur (S)

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3,4-Dichlorothiophene 1,1-dioxide (3,4-DCD) is a diazotising agent that converts primary amines to sulfones. It is a colorless solid with a melting point of 118°C and can be synthesised by the thermal treatment of 3,4-dichlorothiophene. 3,4-DCD has been shown to produce paramagnetic resonance and magnetic spectra when in the presence of transition metal ions. It has also been shown to transfer electrons from one molecule to another. 3,4-DCD is an analog of 2,5-dimethoxybenzaldehyde and is used as an intermediate for organic synthesis.

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Applications 5-(2-Sulfanylidene-3H-1,3-thiazol-4-yl)thiophene-2-carboxamide is a compound involved in the multi-step synthesis of arotinolol hydrochloride. References Liu, H., et al.: Zhongguo Yiyao Gongye Zazhi, 42, 641-644 (2011)

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3-Acetyl-2,5-dichlorothiophene is an antimicrobial agent that has been found to have activity against cancer cells. 3-Acetyl-2,5-dichlorothiophene inhibits the growth of cancer cells by binding to the aldehyde group on proteins and modifying their structure. It also binds to chloride ions and inhibits anhydrase enzymes that are involved in metabolism of sugars and amino acids, leading to increased cell death. 3-Acetyl-2,5-dichlorothiophene has shown toxicity in animals studies at high doses. The LD50 for rats is 1200 mg/kg body weight after oral administration. 3-Acetyl-2,5-dichlorothiophene has been shown to inhibit the growth of chalcone synthase (CHS), an enzyme involved in plant pigments such as anthocyanin or flavonoids production.

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5-Cyanothiophene-2-boronic acid is an ionotropic compound that acts as a hydrogen bond acceptor. It has been shown to inhibit the activity of glutamate receptors and in vitro has been shown to inhibit the activity of the NMDA receptor subtype. 5-Cyanothiophene-2-boronic acid binds to purine derivatives such as adenosine, which are ligands for hydrogen bond acceptors. Its molecular modeling studies show that this compound has a hydrogen bond with its neighboring molecule, which is necessary for it to act as an ionotropic inhibitor.

2-Octylthiophene is an organic solvent that is used as a solvent in the production of polymeric matrixes. It can be used as a radiation absorber, additive to polymer films, and additive to sodium sulfide particles. The properties of 2-octylthiophene make it suitable for use in perovskite solar cells, where it acts as an acceptor and additive to the solid form of the perovskite material. 2-Octylthiophene also has been shown to react with metal halides such as AgX (X = Cl, Br) or CuX (X = I, Br) to produce new reactions products.

Ethyl 5-bromothiophene-2-carboxylate is a bromothiophene derivative that can be used in organic synthesis. It is a synthetic compound that has been used for the preparation of heteroarylations, as well as for cross-coupling reactions. This product was also found to be processable and to have high electronegativity. Ethyl 5-bromothiophene-2-carboxylate is a molecular compound with two functional groups, which are the ethyl group and the thiophene carboxylic acid ester group. The molecule also has an aromatic ring, which means that it can exhibit fluorescence properties in certain conditions.

3-Dodecylthiophene is a small molecule that belongs to the class of thiophenes. It has been shown to have a number of interesting properties, including low energy fluorescence, UV absorption, and nmr spectra. 3-Dodecylthiophene is also an important component in organic electronic devices such as polymer film, lasers, and molecular modeling. It has been shown to have transport properties and can be used as a molecular probe for chemical analysis. 3-Dodecylthiophene has been used in the synthesis of palladium complexes and solid phase microextraction.

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3,5-Dinitrothiophen-2-amine is a chlorophyll analog that can be used to study the electron transfer process in photosystem II. 3,5-Dinitrothiophen-2-amine has been shown to be capable of reacting with exogenous acceptors such as oxygen or nitric oxide and emitting light when excited by light. This compound also has the ability to reduce daltons and act as a redox catalyst. It is used in kinetic studies of enzyme reactions, such as trypsin treatment of chloroplast membranes or the carotenoid biosynthetic pathway.

Methyl 4-bromothiophene-3-carboxylate (MBT) is a lactam compound that has shown antimalarial activity. It is an inhibitor of the enzyme dihydrofolate reductase, which is essential for malaria parasite survival. MBT has been shown to be active against both chloroquine-sensitive and -resistant strains of plasmodium falciparum, as well as against aminopyrimidines. MBT can be synthesized in two steps from commercially available starting materials. The first step involves reduction of 4-bromothiophene-3-carboxylic acid with lithium aluminum hydride to give methyl 4-bromoacetate, which undergoes a Suzuki coupling with methylamine to give the desired product. The second step entails cyclization of methyl 4-bromoacetate with potassium hydroxide to produce the desired product.

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1-(4-Chlorothiophen-2-yl)ethanone is an oxychloride that belongs to the family of thiourea derivatives. It is synthesized by reacting phosphorus oxychloride with 2,3-dichloroacetophenone in a solvent such as dioxane or acetonitrile. The final product is purified by means of vacuum distillation and recrystallization from diethyl ether, hexane, and chlorinated hydrocarbons.

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Dibenzothiophene is a heterocyclic compound with two aromatic rings and one sulfur atom. It is tetranuclear, emitting light in the visible spectrum. Crystallographic studies of dibenzothiophene have shown that it has a number of different coordination modes. These include supramolecular, ligand, and π-π interactions. Dibenzothiophene can be used to transmetallate other metal ions such as anions, halides, and transfer agents. Dibenzothiophenes are also capable of forming dimers through a combination of π-π interactions and hydrogen bonding.

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2-Methyl-1-benzothiophene is a serotonin reuptake inhibitor that has been shown to be an antidiabetic agent with potential for the treatment of inflammatory diseases. It also has been used as a fluorescent probe for sulfoxides and as a fluorescence probe for phosphorus pentachloride. 2-Methyl-1-benzothiophene is structurally related to benzimidazole, which is used in the synthesis of fungicides and herbicides. This chemical compound has been studied extensively for its reaction with carbonyl groups, hydrogen bonds, and steric interactions.

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2-(2-Isothiocyanatoethyl)thiophene is a compound that is used to study the mechanism of HIV infection. It has been shown to inhibit the growth of HIV in the presence of human cells and to block viral production in cell cultures. 2-(2-Isothiocyanatoethyl)thiophene is able to inhibit HIV production by blocking the activity of certain enzymes, such as styryl dehydrogenase and aromatic aldehyde dehydrogenase. These enzymes are involved in the conversion of styryl and aromatic aldehydes into reactive intermediates that can react with nucleic acids. 2-(2-Isothiocyanatoethyl)thiophene also inhibits other enzymes that are responsible for the synthesis of DNA, RNA, and proteins, which may contribute to its anti-HIV activity.

3-Octadecylthiophene is a hydrophobic, semiconducting polymer. It has a high viscosity at room temperature and can be used in microscopy to increase the resolution of images by reducing the depth of field. This material displays a red shift in its nmr spectra as it is heated, which indicates that 3-octadecylthiophene is an oriented polymer. The fluorescence of 3-octadecylthiophene quenches when it is cooled below -10°C and becomes dark blue. This material's optical properties are also affected by its orientation and conformation.

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1-(2-(Benzylthio)-5-chlorothiophen-3-yl)ethanone (1) is a nucleophilic substrate that undergoes Friedel-Crafts reactions with hydrogen peroxide to form an intermediate compound. This intermediate can be further chlorinated by the addition of hydrochloric acid, which generates target products. The optimal reaction conditions for the formation of 1 are at pH 10, at room temperature, and with a concentration of 5% hydrochloric acid. Factors that affect the yield and selectivity of the product include catalyst type and thiophene concentration.

Tetrahydro-4-oxo-3-thiophenecarboxylic acid methyl ester is a synthetic, natural product chemistry. It has potent inhibitory activity against polynuclear anions such as sulfide and dioxane. Tetrahydro-4-oxo-3-thiophenecarboxylic acid methyl ester can be used in the preparation of acrylates and has been shown to have potent inhibitory activity against acetonitrile. Synthetic methods for tetrahydro-4-oxo-3-thiophenecarboxylic acid methyl ester include reacting 6-aminonicotinic acid with thioglycolate in acetonitrile solution, followed by hydrolysis of the resulting 6-(6'-aminohexyloxy)nicotinic acid methyl ester with aqueous base.

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