In the German Patent 1 57573 (1904) it is shown that by the action of at least two molecular proportions of an alkyl formate on two molecular proportions of a magnesium alkyl or aryl haloid, a complex addition compound is formed, which readily decomposes into a basic magnesium salt and an aldehyde, C H MgBr-f-H000R-ROï¿½CHï¿½C H.
If alkyl or aryl-ortho-diamines be used azonium bases are obtained.
Russia's advance westward raised indirectly the Eastern Question, because it threatened two of France's traditional allies, Sweden and Poland, and Choiseul considered that the best means of checkmating Catherine's 7l aryl, aggressive schemes was to incite France's third traditional ally, Turkey, to attack her.
On the chromophoreauxochrome theory (the nitro group being the chromophore, and the hydroxyl the auxochrome) it is necessary in order to explain the high colour of the metallic salts and the colourless alkyl and aryl derivatives to assume that the auxochromic action of the hydroxyl group is only brought strongly into evidence by salt formation.
ALDEHYDES, a class of chemical compounds of the general formula Rï¿½CHO (R=an alkyl or an aryl group).
AMINES, in chemistry, derivatives of ammonia in which one or more of the hydrogen atoms are replaced by alkyl or aryl groups.
The replacement of one hydrogen atom by one alkyl or aryl group gives rise to primary amines; of two hydrogen atoms by two groups, to secondary amines; of three hydrogen atoms by three groups, to tertiary amines.
When heated with alkyl or aryl iodides, they are converted into secondary and tertiary amines.
- Hydrocyanic acid forms two series of derivatives by the exchange of its hydrogen atom for alkyl or aryl groups; namely the nitriles, of type R CN, and the isonitriles, of type R NC. The latter compounds may be considered as derivatives of the as yet unknown isohydrocyanic acid HNC.
This reaction shows that the alkyl or aryl group is attached to the carbon atom in the nitrile.
This reaction shows that the alkyl or aryl group is linked to the nitrogen atom.
AZO COMPOUNDS, organic substances of the type R N:N R' (where R = an aryl radical and R' = a substituted alkyl, or aryl radical).
Grignard (Comptes rendus, 1900 et seq.) observed that magnesium and alkyl or aryl halides combined together in presence of anhydrous ether at ordinary R temperatures (with the appearance of brisk boiling) to form compounds of the type RMgX(R = an alkyl or aryl group and X = halogen).
KETONES, in chemistry, organic compounds of the type R CO R', where R, R' = alkyl or aryl groups.
ESTERS, in organic chemistry, compounds formed by the condensation of an alcohol and an acid, with elimination of water; they may also be considered as derivatives of alcohols, in which the hydroxylic hydrogen has been replaced by an acid radical, or as acids in which the hydrogen of the carboxyl group has been replaced by an alkyl or aryl group. In the case of the polybasic acids, all the hydrogen atoms can be replaced in this way, and the compounds formed are known as "neutral esters."
ETHERS, in organic chemistry, compounds of the general formula R O R', where R, R' =alkyl or aryl groups.