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Topic: Help with a sulfonic acid benzene reaction  (Read 3249 times)

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Offline jmart14

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Help with a sulfonic acid benzene reaction
« on: January 17, 2014, 02:46:03 PM »
So my desired product is ortho phenylenediamine with a sulfate/sulfonic acid group that is para to one amide group and meta to the other. Suggestions? Not neccessarily any specific starting materials.

Offline TheUnassuming

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Re: Help with a sulfonic acid benzene reaction
« Reply #1 on: January 17, 2014, 03:51:23 PM »
A few, though in the interest of keeping with the forum rules how about you start by telling us some of your ideas?
When in doubt, avoid the Stille coupling.

Offline jmart14

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Re: Help with a sulfonic acid benzene reaction
« Reply #2 on: January 18, 2014, 01:15:17 PM »
I am attempting to synthesis benzene with the ortho amines with the sulfo groups on the opposite side to increase water solubility. Once made it will be reacted through a condensation reaction will phendione (1,10-phenanthroline-5,6-dione) to form a dppz (dipyridophenazine) ligand that has the the sulfo group on the opposite end of the phenanthroline. Thus far my attempts were reacting 2-nitro-5-chloroaniline with dimethylamine in DMF with potassium carbonate, NMR resulted in an unexpected spectra, indicating side reactions. However ei-ms indicated the correct product. Upon reduction attempts of the product (desired 2-nitro-5-dimethylaniline) apparently the reaction is extremely air sensitive.

Offline jmart14

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Re: Help with a sulfonic acid benzene reaction
« Reply #3 on: January 18, 2014, 01:22:03 PM »
@ the unassuming, didnt see the rules initially, thanks for the heads up.

Offline TheUnassuming

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Re: Help with a sulfonic acid benzene reaction
« Reply #4 on: January 18, 2014, 02:29:58 PM »
No worries!
Looking around a little bit I was able to find this paper: Tetrahedron Volume 64, Issue 22, 26 May 2008, Pages 5410–5415.  Where they take o-phenylenediamine and cook it at 137C in conc. sulfuric acid to give the product directly in 96% yield!  This would be a much faster and direct method to your desired material. 
Give it a try and let us know how it works out for you!
When in doubt, avoid the Stille coupling.

Offline jmart14

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Re: Help with a sulfonic acid benzene reaction
« Reply #5 on: January 18, 2014, 03:03:13 PM »
Will do, thanks looks useful.

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