Carboxylic Sentence Examples
Its methyl derivatives yield the corresponding carboxylic acids when oxidized by potassium permanganate.
Experience has shown that such mono-derivatives as nitro compounds, sulphonic acids, carboxylic acids, aldehydes, and ketones yield as a general rule chiefly the meta-compounds, and this is independent of the nature of the second group introduced; on the other hand, benzene haloids, amino-, homologous-, and hydroxy-benzenes yield principally a mixture of the orthoand para-compounds.
Another hexa-substituted benzene compound capable of direct synthesis is mellitic acid or benzene carboxylic acid, C6(000H)6.
It is probable that tetrahydro acids are first formed, which suffer rearrangement to orthoketone carboxylic acids.
Potassium persulphate oxidizes it in alkaline solution, the product on boiling with acids giving hydroquiirone carboxylic acid (German Patent 81,297).
Amino derivatives similarly result from thio-ureas and a-haloid ketones; the oxy derivatives from a-sulphocyanoketones by the action of caustic alkali; and the carboxylic acids from chloro-aceto-acetic ester, &c. and thioamides.
Oxy-acids are carboxylic acids which also contain a hydroxyl group; similarly we may have aldehyde-acids, ketone-acids, &c. Since the more important acids are treated under their own headings, or under substances closely allied to them, we shall here confine ourselves to general relations.
Their alkyl derivatives readily oxidize to pyrazine carboxylic acids.
Chromic acid in glacial acetic acid solution oxidizes it to picene-quinone, picene-quinone carboxylic acid, and finally to phthalic acid.
On oxidation .ith chromic acid it forms a quinone, C 15 H 8 0 2, and an a-diphenylene keto carboxylic acid C E I-4 3.Advertisement
It has a strongly acid reaction, being almost comparable with the carboxylic acids.
The oxypyridines may be prepared by distilling the corresponding oxypyridine carboxylic acids with lime, or by fusing the pyridine carboxylic acids with caustic potash.
Quin i c acid, C 6 H 7 (OH) 4 CO 2 H (tetra -oxy.cyclohexane carboxylic acid), is found in coffee beans and in quinia bark.
The Hydrobromide A' acid results on boiling the A 2 acid on reduction with alkalis, or on eliminating hydroHEXAHYDRO bromic acid from i-brom-cyclo-hexane carboxylic acid-I.
Four cyclo-heptene carboxylic acids are known.Advertisement
Cyclo-heptene-i- carboxylic acid-i is prepared from oxysuberanic acid.
Amino-cyclo-heptane (suberylamine) is obtained by the reduction of suberone oxime or by the action of sodium hypobromite on the amide of cycloheptane carboxylic acid.
It may be obtained synthetically by Fittig and Tollens's method (above); by Friedel and Craft's process, devised in 1877, of acting with aluminium chloride on a mixture of benzene and methyl chloride; this reaction leads to the production of higher homologues which may, however, break down under the continued action of the aluminium chloride; or by heating the toluene carboxylic acids obtained by oxidizing the higher homologues of benzene.
One of the most important derivatives of diphenyl, from the theoretical point of view, is diphenic acid or diorthodiphenyl carboxylic acid, which can be obtained from diparadiaminodiphenyldiorthocarboxylic acid, H2N NH 2, or from phenanthrene, the consti Hooc Cooh tution of which it determines.
The attachment method comprises of a hydrophilic polymer network bound to the surface and contains amine or carboxylic reactive groups for end-point attachment.Advertisement
Adding an acid such as hydrochloric acid or sulphuric acid to the sodium carboxylate would free the carboxylic acid.
However, in redox proteins with strong oxidizing centers oxidative decarboxylation of nearby ionized carboxylic groups may be expected to occur to some degree.
Carboxylic acid derivatives - difference in reaction type due to presence of a good leaving group.
An example of such a system is the nucleation of calcite crystals on carboxylic acid terminated alkyl thiols, which produces highly oriented crystals.
Phys., 1888 (6) 14, p. 435); by heating phenol carboxylic acids with baryta; and, in small quantities by the oxidation of benzene with hydrogen peroxide or nascent ozone (A.Advertisement
When digested with fuming hydrochloric acid for some time it is converted into ad furfurane dicarboxylic acid (see Furfurane); while on heating with barium sulphide it is transformed into a - thiophene carboxylic acid (see Thiophene).
Benzidine finds commercial application since its tetrazo compound couples readily with amino-sulphonic acids, phenol carboxylic acids, and phenol and naphthol-sulphonic acids to produce substantive cotton dyes (see Dyeing).
The seeds and stalk contain very little tetrahydrocannabinol carboxylic, or THC, which is the active ingredient that causes psychotropic effects.