J8-Naphthylamine

Very characteristic of citral is the compound which it forms with S-naphthocinchoninic acid. It is obtained in the following manner Twenty grams of citral and 20 grams of pyruvic acid are dissolved in absolute alcohol, and 20 grams of j8-naphthylamine are added. The whole is heated for three hours on the water-bath under a reflux condenser. 

Dichloronitrobenzene has been prepared by deamination of 3,5-dichloro-4-nitroaniline and of 2,4-dichloro-3-nitroaniline. This procedure is an example of the rather general oxidation of anilines to nitrobenzenes with peroxytrifluoroacetic acid. Use of this reagent is frequently the method of choice for carrying out this transformation, and it is particularly suitable for oxidation of negatively substituted aromatic amines. Conversely, those aromatic amines, such as />-anisidine and j8-naphthylamine, whose aromatic nuclei are unusually sensitive to electrophilic attack give intractable mixtures with this reagent. This is not... 

By allowing potassium diselenide to react with diazotiscd j8-naphthylamine. 

This occurs when equimolecular quantities of selenium chloride (SeCl2) and phenyl-j8-naphthylamine are condensed in benzene solution. It crystallises as small, yellow, bushy needles, M.pt. 176° C., readily soluble in boiling benzene or boiling alcohol, sparingly soluble in cold acetic acid. 

Selenodi-j8-naphthylamine separates from benzene as yellowish-green, matted needles, M.pt. 245° C., from nitrobenzene as greenish prisms, and from alcohol in tablets. Its concentrated sulphuric acid solution is blue-green. Addition of ferric chloride to its alcoholic solution gives a moss-green coloration. Nitric acid yields a yellow nitro-compound. 

The most unusual preparation of quinazolines from thioureas is that of Dziewohski et who fused j8-naphthylamine and thiourea to give... 

The following derivatives are stable towards ammonium sulphide p - acetoxymercuri-o-nitroaniline, o - acetoxy mereuri-p-broniodimethyl-aniline, 2 4-diacetoxyniereuri-a-naphthylaniine, and p-dimethylamino-phenylmercuric acetate. If the latter compound be boiled with potassium iodide solution, then treated with hydrogen sulphide, only traces of mercuric sulphide are produced. Mercury compounds from jS-naphthylamine, j8-naphthylamine-C-sulphonic acid, 1 5-naphthyl amine sulphonic acid are decomposed b ammonium suli hide, wiiilst naphthi-onic acid derivatives are only slowty attacked. 

From a solution of 6 4 grams of sodium naphthionate and 6 4 grams of mercuric acetate in 150 c.c, of water, treated with a large excess of sodium hydroxide, a colourless product is obtained. This does not react with ammonium sulphide, and towards halogen salts it reacts similarly to hydroxymercuri - j8 - naphthylamine - 6 - sifiphonic acid (sodium salt). Wlien dried over phosphorus pentoxide the body becomes canary yellow, and on addition of water becomes white again. It has been formulated as the sodium salt of 2-hydro xymermri-naphthionic acid. 

From the tar residue obtained from a hot-water extract of the over-ground parts of this plant, A-phenyl-j8-naphthylamine was isolated. This amine was also found in Reseda lutea, accompanied by the 1,3-benzoxazine luteanine (48). ... 

This product results when phenyl-)3-naphthylamine is used in the general method, or by reduction of 2-j8-naphthylaminopbenylarsinic acid. It crystallises from sym.-tetrachloroethane in ydlow needles, M.pt. 249° to 250 C. The corresponding 12-bromo-derivaiive is obtained by reducing 7 12-benzophenarsazinic acid in alcoholic hydrobromic acid. It forms short, deep, orange-coloured needles, M.pt. 251 to 252° C., with decomposition. 

These aeids are prepared by heating the corresponding j8.naph-tholdisulphonic acids with ammonia. Thus B acid yields R-amido-acid and G-(7)-acid yields G-(7)-amido-acid. The G-amido-add is also obtained by sulphonation of -naphthylamine at 100-140° with fuming sulphuric acid. 

The 2-naphthylamine-appended jS-CyD-calix[4]arene couple 49 showed sensitivity for analytes such as steroids and terpenes with different selectivity from the native CyD. On the other hand, the dansyl-appended j8-CyD-calix[4]arene couple 50 did not show any change in fluorescence intensity upon the addition of guests because of the strong inclusion of the dansyl group into the CyD cavity [166]. 

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