Alkylsulphuric acids

Early studies of the affinity of acid dyes for wool revealed noteworthy correlations with dye structure. For example, in four pairs of monoazo dyes differing only by replacement of a benzene by a naphthalene nucleus, the affinity increase in each pair was consistently within the range -4-6 to -6.3 kj/mol. In three related pairs of dyes, an additional sulpho group reduced the affinity by about -4 kj/mol. In a series of alkylsulphuric acids (ethyl, octyl, dodecyl) and in two series of monoazo dyes containing alkyl chains of increasing length, the increment per methylene group was consistently about -1.66 kj/mol. A close correlation between affinity and Mr was also obtained for a series of substituted phenylazo-l-naphthol-4- sulphonic acid dyes [115]. 

Nitriles can also be obtained by the method of Kolbe alkyl iodides (bromides or chlorides) are heated with alkali cyanide (example, benzyl cyanide), or salts of alkylsulphuric acids are subjected to dry distillation with potassium cyanide ... 

The alkyl group of the salt of the alkylsulphuric acid can also be made available for esterification if the temperature is raised sufficiently. The formation of esters from acid chlorides or anhydrides need only be recalled here. This method also has practical importance. 

Alkylsulphuric acids, similarly corrosive acids based on an alkyl... 

These compounds, which may be considered as chloroanhydrides of alkylsulphuric adds, have little stability. They are readily decomposed by cold water or by the action of the alkali hydroxides with splitting off of the halogen and formation of the alkyl sulphuric acids ... 

---

See also in sourсe #XX -- [ , , ]

---