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Topic: organic synthesis  (Read 4146 times)

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Offline Astrokel

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organic synthesis
« on: November 07, 2008, 12:55:14 AM »
Hi good day all,

my question is how to synthesize propoxybenzene to 4-nitro-2-propoxyphenylamine? well the question specific in 2 steps and identify the intermediate compound. It also says the reactivity of propoxybenzene is similiar to that of phenol

I'm thinking to do nitration first with con. HNO3 and H2SO4 reflux room temperature. And then do Sn, concentrated HCl, reflux followed by NaOH(aq) to liberate the salt.

But my problem is, if i do the nitration, it will direct to 2,4,6 no? That is what my notes said. Also if i did the reduction, both NO2 will be reduced. How to selectively reduced 1 of the N2O to NH2 while keeping the other nitro group?

If i am not being clear let me know, thanks!
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Offline macman104

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Re: organic synthesis
« Reply #1 on: November 07, 2008, 01:17:13 AM »
It says specifically in 2 steps only?

Offline Astrokel

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Re: organic synthesis
« Reply #2 on: November 07, 2008, 01:46:59 AM »
yes

I believe the reason why they mentioned reactivity of propoxybenzene is similar to that phenol is because we only study a few of phenol substiution reactions. One of it is nitration(aqueous and concentrated), and bromination(inert and aqueous). However i am still clueless
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Offline Astrokel

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Re: organic synthesis
« Reply #3 on: November 07, 2008, 01:57:29 AM »
The question is in part d), ignore my writings! Actually, this is A level chemistry paper 3 i had two days ago, although the exam is over but since i will never get back my paper so i wouldn't know the answer might as well ask here. Also i have classmates asking about this because it might come out something smiliar for paper 2 next week.

thanks alot

ps: it says 5-nitro but is in 4 position, right? it that a mistake?
« Last Edit: November 07, 2008, 02:07:30 AM by Astrokel »
No matters what results are waiting for us, it's nothing but the DESTINY!!!!!!!!!!!!

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