It will be nice if you could tell us a bit further on the test and the function of N,N-Dimethyl-1-naphthylamine in the reaction.

Apparently, in this test a sterically hindered tertiary, aryl amine is required. If this is the case, you may try N,N-Dimethylaniline and other similar arylamines.  

Dear Amin,

Would you please, tell us what you want to do with N,N-Dimethyl-1-naphthylamine ?, to any purpose you'd like to use it?.

Best wishes

Dear Amin,

From Wikipedia, the free encyclopedia

N,N-Dimethyl-1-naphthylamine is an aromatic amine. It is formally derived from 1-naphthylamine by replacing the hydrogen atoms on the amino group with methyl groups. N,N-Dimethyl-1-naphthylamine is used in the nitrate reductase test to form a red precipitate of Prontosil by reacting with a nitrite-sulfanilic acid complex.

So, you mean that you want to use it in the nitrate reductase test, is this correct?

Dear Amin,

1-Naphthylamine can be used for possible substitute for N,N-Dimethy

1-naphthylamine.

Please, see the following link:

https://www.google.com.eg/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwiHra-4uPvOAhVHOMAKHcvUDxIQFggaMAA&url=http%3A%2F%2Fmicrobeonline.com%2Fnitrate-reduction-test-principle-procedure-results%2F&usg=AFQjCNFubg7J_yA2sKUodtrQ-N-GyrvVjA&sig2=Kr8L1HVl6IAqd0hEBYy-HQ

Best wishes

Dear Amin,

See also,

https://www.google.com.eg/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwiHra-4uPvOAhVHOMAKHcvUDxIQFggnMAI&url=http%3A%2F%2Fwww.vumicro.com%2Fvumie%2Fhelp%2Fvumicro%2Fnitrate_reductase_test.htm&usg=AFQjCNHOnSn8peeJi5K6x2uh2kGS3hAvnw&sig2=V_A4d0ZEUvbe5QLIa0O4ow

and,

https://www.google.com.eg/search?q=nitrate+reductase+test+procedure&biw=1280&bih=689&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiHra-4uPvOAhVHOMAKHcvUDxIQsAQILQ&dpr=1

Dear Amin,

Find in attached, a doc. on: NITRATE TEST

They used nitrate reagents A (sulfanilic acid) and B (naphthylamine)

In attachment, you find a report on: Nitrate Reduction Test

They used sulfanilic acid and 1-naphthylamine.

Thank you everyone for such kind information. 

Thank you El-Emary for bringing clarity to the question on behalf of Muhammad.

This is a classical example, that highlights the importance of clarity in framing

/ formulating the question.     

I also think, that 1-naphthylamine is suitable.

Thank you too Ashis Ranjan Bandyopadhyay

Yes, Rossen. We hope it works well.