Large numbers of these acid azo-dyes are now made from various diazotised amido-compounds combined with different phenols and phenolic acids.
Diazotised primuline, as already explained, combines in the usual way with amines and phenols to form azo-dyes.
As already explained in connection with salicylic acid, this base and its homologue tolidine form tetrazo-salts, which combine with phenols and amines or their sulpho-acids.
The phenols of naphthalene are called naphthols--they bear the same relationship to naphthalene that carbolic acid bears to benzene.
The alkaline solution, on being drawn off and made acid, yields its mixture of phenols in the form of a dark oil from which carbolic acid is separated by a laborious series of fractional distillations.
Now these phenolsare all more or less acid in character by virtue of the hydroxyl-group which they contain.
Among the compounds associated with the carbolic acid are certain phenolsof higher boiling-point, which bear the same relationship to carbolic acid that toluene bears to benzene.
Nor is this the only instance of its kind, for it has also been observed that a diazo-sulpho-acid of one of the xylenes does not combine with phenols to form azo-dyes excepting under the influence of light.
A very simple and ever-ready way of approximately estimating minute quantities of the phenols consists in shaking up 10 grms.
It is based on the precipitation of the tar acids by bromine, and, of course, all phenols precipitated in this way will be returned as carbolic acid.
Creasote= or =Kreozote= is a term applied to the mixture of crude phenols obtained from the distillation of wood-tar.
One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenol phthale\'8bn.
It is a complex mixture of various phenols and their ethers, and is obtained by the distillation of wood tar, especially that of beechwood.
The molecular weights of the bases, phenols and chemicals employed are the following:-- 1.
The amido-azo bodies, whose compounds with the phenols are also distinguished by their great fastness, are in this respect an exception.
This transformation of allyl phenolsinto propenyl phenols is very general (see Ber.
The following mono-carboxyl acid derivatives of these phenols are, however, found both free and in glucoside formation as constituents of many of the common tannins.
Condensation of Phenols Phenolsulphonic acids exhibit pronounced tendencies to condensation, for which purpose A.
The same substances are formed when phenols are condensed with formaldehyde, especially in the presence of acid contact substances and excess of phenol by sufficiently long heating at certain temperatures.
The tar obtained from the Rochling coal-gas generator contains considerable quantities of phenols (B.
Alkaline solution of phenols may also be condensed, the reaction products, when condensed, constituting tanning matters soluble in water.
The reaction between phenols and aldehydes has been further studied by Michael, [Footnote: Amer.
The quantitative determination of phenols introduced by Bader, [Footnote: Bull.
Condensation of Phenols Condensation of Hydroxybenzene Condensation of Dihydroxybenzene Trihydroxy benzene Polyhydroxybenzenes Quinone Phenolic Ethers Nitro Bodies Amino Bodies Aromatic Alcohols Aromatic Acids 3.
Berthelot and Wollman, he carried out a series of experiments which established the fact that this intoxication is due to poisons of the aromatic group, such as phenols and indols.
I have been fairly successful in combating intestinal putrefaction (phenols and indols),[29] but I could not succeed in getting rid of abundant clostridium butyricum which were implanted in my intestine.
The solution is then acidified, and the phenols are liberated and form an oily layer on the surface of the acid.
Dyeing with Azo Dyes Both the monoamino and the diamino derivatives form intensely colored dyes when diazotized and coupled with phenols and aromatic amines.
So far only the diselenides of anthraquinone and their phenols are recognized remedies(36).
This is caused by the combined water splitting off from the bases and phenols and causing slight explosions in the tar.
This tar contains very little aromatic hydrocarbons, and the phenols are of quite a different character from those obtained in the working of gas-tar.
The oil is mixed with dilute caustic soda solution, and the solution of phenols thus obtained is worked up with that obtained from the next fractions.
CO O O from sodium salts of phenols and [alpha]-chloracetoacetic ester (A.
The volume of separated phenols is observed and stated in percentage on the soap taken.
From the volume of oil dissolved the percentage of phenols is readily calculated.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "phenols" in a variety of sentences. We hope that you will now be able to make sentences using this word.
