From the point of view of the chemistry of the tannins, therefore, the starting-point would naturally be that of synthesising the ester anhydrides of hydroxybenzoic acids.
Amongst the small number of synthetically prepared ester anhydrides of hydroxybenzoic acids, a few occur exhibiting the properties of the natural tannoids.
When the latter are heated, either by themselves or in presence of acids, anhydrides and polymerisation products are formed producing hard, brittle, fusible substances, insoluble in water but fairly soluble in organic solvents.
Of the three classes of isomeric anhydrides which can be formed from hydroxybenzoic acids, the chemistry of the natural tannins is only concerned with the class comprising the ester anhydrides.
The oxides of the second group, which are capable of combining with the bases, are termed anhydrides of the acids or acid oxides.
It must further be remarked that there are oxides formed by the combination of acid anhydrides with basic oxides, or, in general, of oxides with oxides.
From other hydrates the water cannot be separated by any degree of heat, even if they are formed from anhydrides (i.
This is seen from the fact that the anhydrides of the acids are able to combine with basic oxides, and give the same salts as do the acids with the alkalis or hydrates.
N{2}O{4} then acts on water like a mixture of the anhydrides of nitrous and nitric acids.
These compounds are evidently nothing else than mixed anhydrides of hypochlorous and hypoiodous acids, or the products of the substitution of hydrogen in RHO by a halogen (see Chapter XI.
The reactions of alkalis on acids, or anhydrides on water, &c.
They react on water like many anhydrides of the acids, with the evolution of heat and liberation of hydrochloric acid, forming acid hydrates.
Defn: One of a series of organic compounds, regarded as anhydrides of certain hydroxy acids.
Defn: One of a series of anhydrides resembling the lactams, but of an imido type; as, isatine is a lactim.
Defn: One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol.
The iron is soon melted by the flame directed upon it, and the sulphur, phosphorus, and silicon are oxidized by the iron oxide, forming oxides which are anhydridesof acids.
The silicon and carbon burn, followed by the phosphorus and sulphur, and the anhydrides of acids so formed combine with the basic oxides of the lining, forming a slag.
Being nonvolatile, it will drive out most other anhydrides when heated to a high temperature with their salts, especially when the silicates so formed are fusible.
One of a series of organic compounds, regarded as anhydrides of certain hydroxy acids.
One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol.
These organic betaines are internal anhydrides of carboxylic acids, which contain an ammonium hydroxide group in the [alpha]-position.
As before, only true ring nuclei, and not internal anhydrides of aliphatic compounds, will be mentioned.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "anhydrides" in a variety of sentences. We hope that you will now be able to make sentences using this word.
