How can I synthesize mono tosyl group substituted phenylene diamine?

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Hasan Kucukbay

You can choose the nitroanilines as a starting compond, after tosylated the amino group you can use reduction for the nitro group with ETOH/Zn.

Mohyeddin Assali

You can use 1 eq. Of tosyl group and 1 eq of the phenylene diamine, you will get mixture of the disubstituted and monosubstituted which can be easily separated by column chromatography