Tartrazine discovered by Ziegler; manufacture of sulpho-acid of phenylhydrazine and of dioxytartaric acid.
The latter is obtained by the action of a sulpho-acid of phenylhydrazine on dioxytartaric acid, and is a yellow dye, which is of special interest on account of its extraordinary fastness towards light.
By this method the manufacture of phenylhydrazine and other hydrazines is effected on a large scale--all kinds of amido-compounds and their sulpho-acids can be diazotised and reduced to their hydrazines.
Dissolve 2 grams of phenylhydrazine hydrochlorid and 3 grams of sodium acetate in 20 cc.
On the addition of phenylhydrazine it gives a phenylhydrazone, and with hydroxylamine furnishes an C6H5\ C=N.
The hydrazones are best prepared by mixing the aldehyde with phenylhydrazine in dilute acetic acid solution, in the absence of any free mineral acid.
If the sodium sulfite-diazonium salt mixture is acidified before warming or before becoming dark, the red color of the solution does not disappear on heating, and the precipitated phenylhydrazine hydrochloride obtained is colored red.
The crude phenylhydrazine from two lots of aniline (744 g.
Notes If the sodium sulfite solution contains an excess of alkali, a black tar tends to form when the solution is warmed, and very little phenylhydrazine is obtained.
When the distillation is carried out carefully, practically no phenylhydrazine distils with the benzene or other low-boiling impurities.
The benzene solution of phenylhydrazine should be well dried before distilling, since the presence of moisture causes an increased amount of foaming to take place just after the benzene has distilled off.
The free base is liberated by adding to the phenylhydrazinehydrochloride 1 l.
The vapors of phenylhydrazine should not be inhaled.
The phenylhydrazine separates and is taken up with benzene (two 300-cc.
The phenylhydrazine hydrochloride may be purified by crystallizing from water.
Most published directions for the preparation of phenylhydrazine specify the use of zinc dust and acetic acid following the reduction with sodium sulfite.
When this is done, no more phenylhydrazine hydrochloride is obtained by concentration of the mother liquor.
The phenylhydrazine hydrochloride precipitates in the form of slightly yellowish or pinkish crystals which may be filtered off and dried.
The behaviour of the compound towardsphenylhydrazine is also in complete agreement [p050] with this view.
Phenylhydrazine is liberated from the hydrochloride so obtained by adding sodium hydroxide, the solution being then extracted with ether, the ether distilled off, and the residual oil purified by distillation under reduced pressure.
Phenylhydrazine is a colourless oily liquid which turns brown on exposure.
The diazonium chloride, by the addition of an alkaline sulphite, is converted into a diazosulphonate, which is then reduced by zinc dust and acetic acid to phenylhydrazine potassium sulphite.
After fermenting away the hexoses, the residue was treated with phenylhydrazineand an osazone separated.
Oxycelluloses prepared by various methods are found to fix varying proportions of phenylhydrazine (residue), viz.
The molecular proportion of N in thephenylhydrazine residue combining is fractional, representing 1 atom O, i.
The author has also established a relation between the phenylhydrazine fixed and the furfural which the substance yields on boiling with condensing acids.
This is illustrated by the subjoined series of numbers: Phenylhydrazine Furfural Fixed p.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "phenylhydrazine" in a variety of sentences. We hope that you will now be able to make sentences using this word.
