The synthetic dyestuffs and the intermediate products from which they are derived (1920)
Cain, John Cannell, 1871-1921, Thorpe, Jocelyn Field, 1872- · London : C. Griffin · leaf 77
llows :— (I.) A hydroxyl group or an amido-group is in the a-position (1).Combination takes place in the position (4). If this is occupied, or if the positions (3) or (5) are occupied by sulphonic acidgroups, combination takes place in the position (2). The cross indicates the position of the… … SOsH The presence of the sulphonic acid group in any position other than (3), (4), and(5) causes the combination to take place in (4). This also applies to the disulphonic acid derived from a- and /5-naphthol andnaphthylamine. (II.) A hydroxyl group or amido-group is in the ^-position (2).…
Dyes and dyeing
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