I-Nitro-2-naphthol

Sodium i-nitro-2-naphtholate, 13, 78 Sodium perbenzoate, 13, 86 Sodium succinate, 12, 72 Sodium sulfide, 12, 68, 76 16, 72 Soxhlet extractor, 16, 69 17, 74 Stannic chloride, 18,1 Stannous chloride, 17, 10, 11 Steam distillation, rapid, 17, 20 Stilbene, 17, 90... 

Reeves and co-workers [76] correlated the change in the chemical shift of NMR spectra caused by formation of an intramolecular hydrogen bond in o- ubstituted phenols including o-nitrophenol, 2,4-dinitrophenol, I-nitro-2-naphthol, 2,4-dinitro-l-naphthol etc. 

Solochrome black (eriochrome black T). This substance is sodium 1-(1-hydroxy-2-naphthylazo)-6-nitro-2-naphthol-4-sulphonate, and has the Colour Index reference C.I. 14645. In strongly acidic solutions the dye tends to polymerise to a red-brown product, and consequently the indicator is rarely applied in titrations of solutions more acidic than pH = 6.5. 

Nitrophthalic acid has usually been prepared by nitration of phthalic add or phthalic anhydride, followed by separation from the accompanying 3-nitrophthalic acid. It has also been prepared from 6-nitro-2-naphthol-4-sidfonic acid (obtained from the technical diazo-anhydride of 6-nitro-i-amino-2-naphthol-4-sulfonic acid). The present procedure is more convenient than any of the earlier methods. 

Procedure. One drop of the test solution is placed on a filter paper and sprayed with a 0.1 % solution of 6-nitro-2-naphthol-8-sulfonic acid followed, after 6 minutes, with cone, ammonia. Under u.v. light, an intense blue fluorescence indicates the presence of Sn i ions. 

Nitro-4-lodo-1-Oxy-Naphthalene (2-Nitro-4-iodo-l-naphthol). (02N)C1oHs(I).OH, mw 315.09, N 4.45%, OB to C02 -101.56%, clear golden needles, mp 115° (decompn). Prepn from 4-nitro-2-acetoxymercuric-naphthol-(l) by reacting with iodine... 

Aromatic tertiary amines and phenolic compounds undergo nuclear nitro sation, as illustrated by the synthesis of p>nitrosodimethyl aniline (89%)i nitrosophenol (80%), and l-nitroso-2-naphthol (99%) In the reaction of a-naphthol, an isomeric mixture of the nitrosonaphthols is obtained. The nitrosation of phenols with nitrous acid usually produces p nitroso compounds however, o-nitiosophenols can be prepared by nitrosating phenols in the presence of cupric sulfate. ... 

Nitro-l-diazo-2-naphthol [called 4-Nitro-i -diazo-naphthol (2) or 4-Nitro-naphthochinon... 

Hydroxy-3-[ 2-hydroxy-l naphthalenyt)azd -5-nitrobenzenesulfonic acid, 9CI. l- 2-Hydroxy-3-nitro-5-sulfophenylaz6)-2-naphthol. C.I. Mordant black 15. Fast grey RA. Solochrome fast grey RAS. Wool grey N. C.I. 15690. Alizarine Chrome black 4R. Numerous other proprietary names [25747-09-5]... 

Martius Yellow.—In a similar way the nitro naphthalenes are only faintly colored and are not valuable as dyes while the mixed nitro and hydroxy naphthalenes are colored compounds. One of these is a yellow dye which was formerly used to dye wool and silk but is now principally used in dyeing soaps. It is the 2-4-di-nitro i-naphthol which in the form of its sodium, calcium or ammonium salt is known as Martius yellow. 

Naphthol Yellow S.—A sulphonic acid derivative of this, viz., 2-4-di-nitro i-naphthol 7-sulphonic acid in the form of the potassium salt is known as Naphthol Yellow S. 

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