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4-Nitrothiophenol is an organosulfur compound with the formula HSC 6 H 4 NO 2. It exists as a yellow solid that is soluble in several organic solvents. It is one of three isomers of nitrothiophenol. It was originally prepared by sulfidation of 4-nitrochlorobenzene, [1] which was improved by intentionally generating a polysulfide intermediate.
A solution of 4-nitrophenol appears colorless below pH 5.4 and yellow above pH 7.5. [3] This color-changing property makes this compound useful as a pH indicator. The yellow color of the 4-nitrophenolate form (or 4-nitrophenoxide) is due to a maximum of absorbance at 405 nm (ε = 18.3 to 18.4 mM −1 cm −1 in strong alkali). [4]
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Para red (paranitraniline red, Pigment Red 1, C.I. 12070) is a dye.Chemically, it is similar to Sudan I.It was discovered in 1880 by von Gallois and Ullrich. It dyes cellulose fabrics a brilliant red color, but is not very fast.
with the formula HOC 6 H 4 NO 2.Three isomeric nitrophenols exist: . o-Nitrophenol (2-nitrophenol; OH and NO 2 groups are neighboring, a yellow solid.; m-Nitrophenol (3-nitrophenol, CAS number: 554-84-7), a yellow solid (m.p. 97 °C) and precursor to the drug mesalazine (5-aminosalicylic acid).
A gray catbird's song is easily distinguished from that of the northern mockingbird (Mimus polyglottos) or brown thrasher (Toxostoma rufum) because the mockingbird repeats its phrases or "strophes" three to four times, the thrasher usually twice, but the catbird sings most phrases only once. The catbird's song is usually described as more raspy ...
The green catbird (Ailuroedus crassirostris) is a species of bowerbird found in subtropical forests along the east coast of Australia, from southeastern Queensland to southern New South Wales. It is named after its distinctive call which sounds like a cat meowing, although it has also been mistaken for a crying child.
4-Nitrobiphenyl is an organic compound with the formula C 6 H 5 −C 6 H 4 NO 2. It is one of three isomers of nitrobiphenyl and probably the most widely used. It is a precursor to the antioxidant 4-aminobiphenyl. 4-Nitrobiphenyl is readily prepared by nitration of biphenyl. [1] It can also be prepared by cross-coupling reactions. [2]