1. Tautomeric transpositions may take place in these hydroxyazo-compounds by the addition of a potassium hydroxide solution, with an accompanying change in colour.2. We can respectively assign A(azo)-, R(red)-, and B(blue)-forms to these tautomers. (Sometimes we recognise more readily the mixture of these forms.)3. Tautoinerism is due to the labile hydrogen atoms in hydroxyl-groups which take the ortho- or para-position with respect to the azo-group.4. The hydrogen atom which is in the meta hydroxyl-group with regard to the azo-group does not only move by itself, but moreover hinders the transposition of the other hydrogen atoms.5. When there are many labile hydrogen atoms, mutual hindrance may occur.6. B-form is sometimes produced only when there is a para nitroradical with regard to the azo-group.7. Nitro-groups which take the ortho- or meta-position with respect to the azo-group do not change into the isonitro-structure.8. The nitro-group has considerable bathochromic influence upon these hydroxyazo-compounds.9. Generally only one absorption band exists in the solutions, of these substances, but there are two bands when methyl-group is included.
1.2. 我们可以将 A(偶
氮)-、R(红色)- 和 B(蓝色)- 分别归类为这些同系物。(4. 相对于偶
氮基处于元羟基上的
氢原子不仅自己移动,而且还会阻碍其他
氢原子的移位。 5. 当存在多个易变
氢原子时,可能会出现相互阻碍的情况。8. 硝基对这些羟基偶
氮化合物有相当大的浴变色作用。 9. 一般来说,这些物质的溶液中只有一条吸收带,但如果含有
甲基,则有两条吸收带。