CAS:39603-24-2 | 5,7-Dimethylindoline-2,3-dione

The corresponding substance of CAS No. 39603-24-2 is 5,7-Dimethylindoline-2,3-dion, also known as 5,7-Dimethylisatin, molecular formula C₁₀H₉NO₂, molecular weight 175.184, appearance is red to red-brown powder, refractive index 1.586, melting point 245°C, density 1.25g/cm³.It has better solubility under acidic conditions, but poor solubility under alkaline conditions. The compound is relatively stable in dry state, but gradually decomposes under light.

Uses:
5,7-Dimethylindoline-2,3-dione is mainly used as organic dyes. It has good dyeing properties on silk, cotton fabric, paper and other materials. This compound can also be used to prepare pigments, inks, plastic dyes, etc.
Method of Preparation:
5,7-Dimethylindoline-2,3-dione can be synthesised by a reaction between p-thiourea and sodium p-tolyl. Thiourea is reacted with dimethylcarbamide to form N,N'-dimethylurea. Next, the urea compound is interacted with sodium p-tolyl and acid hydrolysed to give 5,7-dimethylisatin.

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