Notes In the presence of sodium benzylate two molecules of benzaldehyde react with the alcoholate to form an addition product.
Commercial benzaldehyde can be used in place of the purer product, but the amount used must be increased to make up for the impurities which are present.
The benzaldehydeshould be titrated in order to determine its acidity.
Condensation with formaldehyde always succeeds, with acetaldehyde and benzaldehyde only partly.
The oil consists almost entirely of benzaldehyde which may be estimated by absorption with a hot saturated solution of sodium bisulphite.
The natural oil may frequently be differentiated from artificial benzaldehyde by the presence of chlorine in the latter.
The same author states that the leaves of Gymnema latifolium, one of the Asclepiads, yields to distillationbenzaldehyde hydrocyanide.
When heated with lime, it is decomposed, benzene being formed; if its vapours are passed over heated zinc dust, it is converted into benzaldehyde (A.
It can be prepared by the oxidation of toluene, benzyl alcohol, benzaldehyde and cinnamic acid; by the oxidation of benzene with manganese dioxide and concentrated sulphuric acid in the cold (L.
C6H5, a ketone-alcohol, which may be prepared by boiling an alcoholic solution of benzaldehyde with potassium cyanide; by reducing benzil (C6H5CO.
By fusion with alkali it is converted into benzil; and with an alcoholic solution of benzaldehyde in presence of ammonia it forms amarine (triphenyl dihydro-glyoxaline).
On account of the readiness with which it condenses with various compounds, benzaldehyde is an important synthetic reagent.
This combination is separated from the remaining fluid, decomposed by acid and submitted to distillation, whereby benzaldehyde passes over.
This conversion is readily effected by continuously boiling, best with the introduction of carbonic acid, 1 part of benzyl chloride with 1½ parts of lead nitrate and 10 parts of water, and finally distilling the benzaldehyde off by steam.
Large quantities of benzaldehyde are at present prepared according to this method.
It is prepared by oxidizing cinnamyl alcohol, or by the action of sodium ethylate on a mixture of benzaldehyde and acetaldehyde.
They form condensation products with aldehydes, benzaldehyde and aniline forming benzylidene aniline, C6H5N: CHC6H5, and when heated with acids they form anilides.
Sulphuric acid decomposes it into d-glucose, benzaldehyde and prussic acid; while hydrochloric acid gives mandelic acid, d-glucose and ammonia.
The next step usually breaks the latter at the point indicated by (2), yielding glucose andbenzaldehyde cyanhydrin, or mandelo nitrile.
The latter in turn breaks down at (3) into benzaldehyde and HCN.
When completely hydrolyzed, it yields two molecules of glucose and one each of benzaldehyde and hydrocyanic acid.
On hydrolysis, dhurrin first yields glucose and paraoxy-mandelo nitrile; the latter then breaks down into paraoxy-benzaldehyde and HCN.
It also shows all the condensation reactions of benzaldehyde (q.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "benzaldehyde" in a variety of sentences. We hope that you will now be able to make sentences using this word.
