Methyl toluenesulfonate (CAS 28804-47-9), also called methyl o/p-toluenesulfonate or OPTSM, is supplied as a mixture of the ortho and para isomers, a colourless to slightly yellow liquid with a density of about 1.41 grams per cubic centimetre and a strong aromatic odour. It is the methyl ester of toluenesulfonic acid and a potent methylating agent:
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O-Methylisourea sulfate (CAS 29427-58-5), named in the CAS registry as carbamimidic acid methyl ester sulfate and also listed as O-methylisourea hydrogen sulfate or bisulfate, is the sulfuric acid salt of the reactive, volatile and strongly basic free base O-methylisourea. It is a white crystalline, water-soluble solid with the EINECS number 249-622-6, stable when kept dry
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As an essential organophosphorus catalyst and pharmaceutical intermediate, it is widely utilized in organic synthesis, including olefination and Suzuki reactions. Notably, it serves as a key raw material for synthesizing the active pharmaceutical ingredient (API) Sacubitril, a medication used to treat heart failure. It is also employed in manufacturing agrochemicals and dyestuffs.
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As a versatile building block, it serves as a crucial intermediate in the pharmaceutical industry for synthesizing antiviral, antifungal, and anticancer agents, such as pyrazole derivatives. In agrochemicals, it is used to manufacture targeted herbicides and pesticides. Additionally, it acts as a valuable reagent in organic chemical synthesis and chemical research. Due to its high
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Potassium 4-nitrophenolate (CAS 2840-22-4), also called potassium p-nitrophenolate or 4-nitrophenol potassium salt, is the potassium salt of 4-nitrophenol and appears as an intense yellow crystalline solid or powder that is readily soluble in water. The salt is strongly coloured in the visible region because the phenolate anion is highly conjugated with the para nitro group,
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4-(N-ethyl-N-2-hydroxyethyl)-2-methylphenylenediamine sulfate (CAS 25646-77-9), is a white to off-white crystalline powder that serves as the colour developing agent in modern colour negative photographic processes. It is a para-phenylenediamine derivative bearing an ethyl group and a hydroxyethyl group on one nitrogen and a methyl group on the aromatic ring, an asymmetric substitution pattern developed for the
Poly(sodium 4-styrenesulfonate) (CAS 25704-18-1) is the water-soluble sodium salt of polystyrenesulfonic acid, a linear anionic polyelectrolyte whose chains carry a sulfonate group on every aromatic ring. It is supplied as a white to off-white powder or as an aqueous solution, with weight-average molecular weights ranging from a few thousand to over one million, and narrow-polydispersity
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This compound (CAS 258872-05-8), also abbreviated TBPDPS-PFBS, is a triarylsulfonium salt in which a diphenyl(4-tert-butylphenyl)sulfonium cation is paired with the nonafluorobutanesulfonate anion, sometimes written as (4-(tert-butyl)phenyl)diphenylsulfonium 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulfonate. It is a white to off-white solid that is thermally stable and soluble in the organic solvents used for photoresist formulations, and it is stored sealed and dry
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Sorbitan monopalmitate (CAS 26266-57-9), widely known by the trade name Span 40, is a nonionic sorbitan fatty acid ester made from sorbitol and palmitic acid. It is a waxy, cream-coloured solid with a melting point of about 46 to 47 degrees Celsius and a hydrophilic-lipophilic balance of approximately 6, which places it among the more
Trimethylsilyl trifluoromethanesulfonate (CAS 27607-77-8), commonly called TMS triflate or TMSOTf and listed with EC number 248-565-4, is a colourless to pale yellow liquid and one of the most reactive silylating agents available, supplied at 99 percent purity. It is strongly moisture sensitive and corrosive, fuming in humid air and hydrolysing rapidly to hexamethyldisiloxane and trifluoromethanesulfonic
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4,5-Bis(2-methoxyethoxy)-2-nitrobenzonitrile (CAS 236750-65-5) is a benzene ring carries two methoxyethoxy side chains, a nitro group and a nitrile group. It is recorded in the GSRS substance registry and is an established advanced intermediate and specified impurity of the anticancer drug erlotinib, an epidermal growth factor receptor tyrosine kinase inhibitor used in non-small-cell lung cancer and
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Pyridinium p-toluenesulfonate (CAS 24057-28-1), universally abbreviated PPTS, is the colourless to white crystalline salt formed from pyridine and p-toluenesulfonic acid, supplied as a white to almost white powder or crystal with an assay of 98 percent or higher. It is a non-hygroscopic, easy-to-weigh solid that is soluble in water and polar organic solvents and is
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Oleamidopropyl betaine (CAS 25054-76-6) is an amphoteric surfactant derived from oleic acid in which the fatty amide chain is linked through a propyl spacer to a betaine head group, a quaternary ammonium carboxylate. It is normally supplied as a pale yellow to amber aqueous solution containing 30 to 40 percent active matter and is compatible
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Kanamycin A sulfate (CAS 25389-94-0), also catalogued as kanamycin sulfate or kanamycin A monosulfate, is the sulfate salt of kanamycin A, an aminoglycoside antibiotic originally isolated from the soil bacterium Streptomyces kanamyceticus. It is a white to off-white, highly water-soluble powder that is stable in the dry state at 98 percent purity or higher and
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Diethoxydiphenylsilane (CAS 2553-19-7), also named diphenyldiethoxysilane, is a colourless to almost colourless clear liquid in which a phenyl-rich silicon centre bears two hydrolytically active ethoxy groups, supplied at 98 percent purity or higher by gas chromatography. It is moisture sensitive and hydrolyses in the presence of water to give diphenylsilanediol and crosslinked diphenylsiloxane condensation products,
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2-Ethoxy-1-naphthoic acid (CAS 2224-00-2) is a white to yellowish crystalline powder with a distinct odour that combines a naphthalene ring, an ethoxy substituent at the 2-position and a carboxylic acid at the 1-position. It is soluble in common organic solvents and only sparingly soluble in water, and its solubility behaviour in ethanol, methanol and other
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