The synthetic dyestuffs : and the intermediate products from which they are derived (1905)
Cain, John Cannell, 1871-1921, Thorpe, Jocelyn Field, 1872-1940 · London : C. Griffen and Co. · leaf 216
The formation of the latter acid at a higher temperature is regarded as havingbeen preceded by the initial formation of the 1 : 5 acid, which undergoes molecularchange in the direction indicated, at a higher temperature. Further, on sulphonating naphthalene-/J-sulphonic acid we obtain … SO.H SO3H in a similar way. An interesting case of molecular change where an excess of sulphuric acid isnot present is that undergone by naphthionic acid. If this substance be heatedwith two to three parts of naphthalene to the boiling-point of the latter (217°),the SOoH group migrates from the…
Dyes and dyeing
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