|
Phenylenediamine
Phenylenediamine may refer to: * ''o''-Phenylenediamine or OPD, a chemical compound C6H4(NH2)2 * ''m''-Phenylenediamine or MPD, a chemical compound C6H4(NH2)2 * ''p''-Phenylenediamine or PPD, a chemical compound C6H4(NH2)2 Related compounds * ''N,N''-Dimethyl-''p''-phenylenediamine or DMPD * ''N,N,N′,N′''-Tetramethyl-''p''-phenylenediamine or TMPD, used in microbiology * ''N'',''N''-Diethyl-p-phenylenediamine or DPD {{Chemistry index Diamines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
O-Phenylenediamine
''o''-Phenylenediamine (OPD) is an organic compound with the formula C6H4(NH2)2. This aromatic diamine is an important precursor to many heterocyclic compounds. OPD is a white compound although samples appear darker owing to oxidation by air. It is isomeric with ''m''-phenylenediamine and ''p''-phenylenediamine. Preparation Commonly, 2-nitrochlorobenzene is treated with ammonia to generate 2-nitroaniline, whose nitro group is then reduced: :ClC6H4NO2 + 2 NH3 → H2NC6H4NO2 + NH4Cl :H2NC6H4NO2 + 3 H2 → H2NC6H4NH2 + 2 H2O In the laboratory, the reduction of the nitroaniline is effected with zinc powder in ethanol, followed by purification of the diamine as the hydrochloride salt. Darkened impure samples can be purified by treatment of its aqueous solution with sodium dithionite and activated carbon. Reactions and uses ''o''-Phenylenediamine condenses with ketones and aldehydes to give rise to various valuable products. Its reactions with formic acids to produce benz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DMPD
''N'',''N''-Dimethylphenylenediamine is an organic compound with the formula . It is one of the phenylenediamines, a class of compounds that have long attracted attention for their redox properties. This diamine is, for example, easily oxidized to a deep red radical cation, which is called Wurster's Red. The related Wurster's Blue cation has four N-methyl groups Synthesis Dimethyl-4-phenylenediamine is prepared by the nitration of dimethylaniline followed by reduction of the resulting 4-nitrodimethylaniline. A variety of methods have been examined. Applications Dimethyl-4-phenylenediamine can be converted to methylene blue by reaction with dimethylaniline and sodium thiosulfate in several steps: : It reacts with carbon disulfide Carbon disulfide (also spelled as carbon disulphide) is an inorganic compound with the chemical formula and structure . It is also considered as the anhydride of thiocarbonic acid. It is a colorless, flammable, neurotoxic liquid that is used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wurster's Blue
Tetramethylphenylenediamine (TMPD) is an organic compound with the formula . It is most studied of three isomers of this formula. It is a colorless solid. With two dimethylamino substituents, the ring is particularly electron rich. Redox behavior One-electron oxidation of TMPD gives the deep blue radical cation called Wurster's blue, . It was one of the first radical cations to be reported. Many properties have been described including its rapid rate of Outer sphere electron transfer, self-exchange: : X-ray crystallography of the TMPD and its iodide salt reveals that oxidation most strongly contracts the C-N(CH3)2 and the HC---CH bonds, indicating that oxidation gives a quinoid-like species. The monocation illustrates an early step in the oxidation of p-phenylenediamine derivatives, which are widely used for hair dying. N,N-Dimethylphenylenediamine () also easily oxidizes to a radical cation, called Wurster's Red. The hydrochloride salt of TMPD has been used as a redox ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Color Developing Agent 1
Color Developing Agent 1 (CD-1) is the first in the series of color developing agents used in developing color films. It is the organic compound ''N'',''N''-diethyl-1,4-benzenediamine (DPD), which is usually in the form of the mono hydrochloride salt. In color development, after reducing a silver atom in a silver halide crystal, the oxidized developing agent combines with a color coupler to form a color dye molecule. Arthur Thomas Palin, a Fellow of the Royal Society of Chemistry, developed a widely used color based method of water testing using DPD to indicate the chlorine content of treated water. See also * Color Developing Agent 2 * Color Developing Agent 3 * Color Developing Agent 4 The fourth in the series of color developing agents used in developing color films, commonly known as CD-4, is chemically known as 4-(N-Ethyl-N-2-hydroxyethyl)-2-methylphenylenediamine sulfate. In color development, after reducing a silver atom i ... References Photographic chemical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
