Réaction #1766722

Équation de réaction

methyl p-toluenesulfonate

2-(p-dimethylaminophenylazo)-6-methoxybenzothiazole

methyl p-toluene sulfonate

→

2-(p-Dimethylaminophenylazo)-6-methoxy-3-Methylbenzothiazolium p-Toluenesulfonate

Conditions de réaction

Traitement

1. 1
   Températureheated to about 80°-85° C
2. 2
   workup.WAITThe reaction mixture was then blended for an additional 30 minutes at 85°-90° C
3. 3
   AutreThe product was obtained
4. 4
   Autrein high yield

Mode opératoire

A mixture of 17.3 pounds (25.2 moles) of 2-(p-dimethylaminophenylazo)-6-methoxybenzothiazole and 51.6 pounds of dextrine were blended in a 4.6 ft. Littleford-Lodige precision blender, heated to about 80°-85° C, and 10.3 pounds (25.1 moles) of methyl p-toluene sulfonate added thereto portion wise over a period of about 10 minutes so that the temperature did not exceed about 90° C. The reaction mixture was then blended for an additional 30 minutes at 85°-90° C. The product was obtained in high yield and contained less than 1% of the dye base and less than 0.5% of methyl p-toluenesulfonate.

Source