As a reducing agent, acetic aldehyde is used in the form of aldehyde ammonia, prepared by passing dry ammoniacal gas into aldehyde.
Four grams of silver nitrate and 2-1/2 grams of aldehyde ammonia are separately dissolved in a litre of distilled water, and the solutions mixed and filtered.
Produced during the manufacture of the Hofmann colours, and is now used for dyeing cotton and silk; its colour being bluer than that of aldehyde green, it is more useful.
CH3, first obtained as a condensation product of aldehyde and aniline, and regarded as a derivative of quinoline; -- called also methyl quinoline.
Defn: A white crystalline substance isomeric with, and obtained from, acetic aldehyde by polymerization, and reconvertible into the same.
Defn: Pertaining to, or designating, an aldehyde acid, intermediate between glycol and oxalic acid.
Defn: A base, C10H19N, produced by heating valeric aldehydewith ammonia.
Defn: An oily substance obtained by the distillation of castor oil, recognized as the aldehyde of oenanthylic acid, and hence called also oenanthaldehyde.
Defn: A base resembling and isomeric with conine, and obtained as a colorless liquid from butyric aldehyde and ammonia.
The monosaccharides are all open-chain compounds containing hydroxyl groups and either an aldehyde group or a ketone group.
Defn: A polymeric modification ofaldehyde obtained as a white crystalline substance.
Defn: To change into another substance having the same atomic proportions, but a higher molecular weight; to undergo polymerization; thus, aldehyde polymerizes in forming paraldehyde.
Defn: A white crystalline aldehyde having a burning taste and characteristic odor of vanilla.
OH, and can be oxidized so as to form a corresponding aldehyde and acid having the same number of carbon atoms; -- distinguished from secondary and tertiary alcohols.
Defn: One of a class of carbohydrates having from three to nine atoms of carbon in the molecules and having the constitution either of an aldehyde alcohol or of a ketone alcohol.
In this way the last portion of the aldehyde is absorbed, and the potash solution gradually assumes an amber colour.
Finally the aldehyde may simply be converted into the corresponding acid by oxidation as appears to take place in the formation of succinic acid.
Fusel oil would be formed by the reduction of the aldehydes arising from the simple monobasic amino-acids, succinic acid would be produced by oxidation of the aldehyde derived from the dibasic glutamic acid.
The method used by Kostytscheff for the separation of alcohol and aldehyde (treatment with bisulphite) has also proved unsatisfactory in their hands and the results obtained as to the reduction of acetaldehyde by yeast, etc.
The intermediate production of an aldehyde would thus be consistent both with the production of alcohols and acids from amino-acids.
Instead of the beta-hydroxyfurfural (ante, 115) we obtain the delta-aldehyde as the first product.
The aldehyde gives yellow or colourless solutions in various solvents, which are turned purple by a sufficient excess of hydrogen bromide.
The total furfural is rapidly formed, whereas the volatile acid continues to be formed long after the aldehyde ceases to come over.
Both aldehyde and acid appear to be the alpha beta derivatives.
Chardonnet found similar results from the addition of aldehyde and other reagents (14), but not such as to be employed for the more concentrated collodions.
The carbon disulphide and salicylic aldehyde products have also been used as means of distinction, as has also the formation of the stilbazonium bases obtained by condensing ortho-semidines with benzil (O.
Besides methyl salicylate, the oil contains triaconitane, an aldehydeor ketone, and an alcohol.
Citral, the aldehyde occurring largely in lemon-grass and verbena oils, also to a less extent in lemon and orange oils, and possessing an intense lemon-like odour.
Besides cinnamic aldehyde the oil contains eugenol and phellandrene.
The value of this oil is not determined entirely by its aldehyde content as is the case with cassia oil, and any oil containing more than 75 per cent.
The value of the oil depends upon its aldehyde content, the chief constituent being cinnamic aldehyde.
The aldehyde citronellal is converted by acetic anhydride into isopulegol acetate, so that this is also included in the determination of graniol in citronella oil.
Citronellal, an aldehyde possessing the characteristic odour of citronella oil, in which it occurs to the extent of about 20 per cent.
The contents of the flask soon become red owing to the liberation of free alkali by the combination of the aldehyde with part of the sodium sulphite, and this coloration is just discharged by the addition of sufficient 10 per cent.
This aldehyde is a body that can be polymerized, that is to say, is capable of combining with itself a certain number of times to form complexer bodies, especially glucose.
The thermal effect of the aldehyde group has the average value 64.
By the action of hydroxylamine or phenylhydrazine on aldehydes or ketones, condensation occurs between the carbonyl oxygen of the aldehyde or ketone and the amino group of the hydroxylamine or hydrazine.
COOH, with various aliphatic aldehydes, and obtained from two molecules of the acid and one of the aldehyde in the presence of baryta water alkylic isophthalic acids: with acetaldehyde [1.
It is not possible to obtain the aldehyde in a pure condition, since it readily polymerizes.
When two or three drops of sulphuric acid and furfur aldehyde (5 drops to 10 c.
Aldehyde is recognised by its reducing action on argentic nitrate; the mineral acids by the reddening of litmus paper, and the appropriate tests.
Loew considers that all substances which enter into combination with aldehyde or ketone groups must be poisonous to life generally.
A substance increases in poisonous character through every influence which increases its power of reaction with aldehydeor amido groups.
Equal volumes of cobra venom andaldehyde were mixed, and a quantity equivalent to 1 mgrm.
Heated with lime, very distinct odors of benzoic aldehyde are developed.
The aldehyde group reacts with hydrocyanic acid to produce two stereo-isomeric cyanhydrins; this isomerism is due to the conversion of an originally non-asymmetric carbon atom into an asymmetric one.
A white crystalline aldehyde having a burning taste and characteristic odor of vanilla.
The slightly moistaldehyde is distilled under diminished pressure from an oil bath, by means of a 1-l.
In the reprecipitation of a deeply colored product, the portion of aldehyde at the end may be even purplish in color and particular care must be taken to keep this separate.
Notes The aldehyde that is obtained without reprecipitation gradually takes on a pinkish tinge on exposure to light.
The aldehyde separates, and is filtered with suction.
At the beginning, the aldehydecomes down slightly colored.
Thorough washing of the crude aldehyde is particularly desirable, as it removes a reddish impurity which tends to distil over and color the product lemon yellow or sometimes even brownish yellow.
In purifying the aldehyde by dissolving in acid and reprecipitating, it is essential not to use stronger acid than that specified (1:6), as stronger acid causes a deepening of the color of the solution.
The aldehyde prepared in this way is in the form of small granular crystals, which vary in different runs from a flesh color to a lemon yellow.
Further purification can be accomplished by dissolving the aldehyde (it dissolves slowly) in dilute hydrochloric acid (1 part of concentrated acid, sp.
If the aldehyde is dried before distilling, it is possible to use a 500-cc.
The rest of the aldehyde is now precipitated by means of more sodium hydroxide solution, and comes down almost white.
The process depending on the use of nitrobenzoic aldehyde is much simpler; but the particular nitro-derivative of the aldehyde which is required is at present difficult to make, and therefore expensive.
Two methods have been used for the production of artificial indigo--benzal chloride being the starting-point in one of these, and nitrobenzoic aldehyde in the other.
The action between benzoic aldehyde and other bases analogous to dimethylaniline was found to be quite general, and the principle was extended to diethylaniline and similarly constituted bases.
Benzoic aldehyde or bitter-almond oil is one of the oldest known products of the vegetable kingdom, and has from time to time been made the subject of investigation by chemists since the beginning of the century.
In one operation, therefore, setting out from toluene, we make these two natural products, the aldehydeand acid, which are easily separable by technical processes.
Miller prepared a homologue of quinoline (quinaldine) in 1881, by the action of sulphuric acid and a certain modification of aldehyde known as paraldehyde on aniline.
A mixture of vanillin and benzoic aldehyde when attenuated to a state of extreme dilution in a spirituous solvent, gives the perfume known as "heliotrope.
By heating phenol with caustic alkali and chloroform, the aldehydeof salicylic acid, i.
By a variety of ingenious arrangements formic aldehyde has been tested by a large number of observers during the last two or three years.
Formic aldehyde may also be used by lamp or autoclave.
The combination of hydrogen withaldehyde may be taken as an example.
The author has now proved that under the same conditions by which ordinary alcohol affords aldehyde, styrone affords the aldehyde of cinnamic acid, that is, oil of cinnamon.
It is only necessary to moisten platinum black with styrone, and let it remain in the air some days, when by means of the bisulphite of potash the aldehyde double compound may be obtained in crystals, which should be washed in ether.
As can be seen from the above table, the addition of chlorocinnamic aldehyde lowers the melting point of the bromo-compound.
An illustration of this rule is afforded by the two substances chloro- and bromo-cinnamic aldehyde already mentioned.
It would seem, then, that luciferin must contain no aldehyde group.
In the presence of the perhydridase the oxygen of water oxidizes the aldehyde and the hydrogen set free reduces any easily reducible substance which may be present.
Trautz (1905), from his extensive study of the chemiluminescence of phenol and aldehyde compounds came to the conclusion that luminescence intensity was proportional to reaction velocity.
The boiled-liver extract has no reducing action of its own, but supplies a substance similar to thealdehyde which has been spoken of as co-enzyme.
If some aldehyde is added, fresh milk will reduce methylene blue to its leuco-base or nitrates to nitrites, upon standing a short time.
There is probably a substance acting as thealdehyde in the luciferase-oxyluciferin solution.
There is no reduction if the milk, methylene blue, and aldehyde are agitated with air.
Milk will reduce methylene blue without aldehyde if bacteria are present in large numbers.
There is no reduction unless an aldehyde is added or unless some boiled extract of a tissue such as liver is added.
The aldehyde is oxidized to its corresponding acid.
I find that milk is a favorable and convenient medium for the reduction of oxyluciferin and that it acts without the addition of an aldehyde or the presence of bacteria.
He studied the formation of aldehyde from alcohol by various methods, also obtaining its crystalline compound with ammonia, and he was the discoverer of furfurol.
Among the first class, aerial or gaseous disinfectants, formic aldehyde has of late years taken foremost place.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "aldehyde" in a variety of sentences. We hope that you will now be able to make sentences using this word.
