Science Help

[Luke1993]

I thought this was more for school-related problems, since, you know, we are regularly too shy to ask?

Yeah it is supposed to be, sorry for asking non study-related questions lol

 

[DanFC]

I do English Chemistry so I'm not too sure because we use IUPAC chemical nomenclature. But I looked up 4-nitroaniline and we would call it 1-amino-4-nitrobenzene.

I would assume it would perhaps be a nucleophilic substitution reaction? The Nitrogen of the amino group would be drawing the electron density of the carbon on the benzene ring towards it therefore making the carbon partially positive. This would leave it open to nucleophilic attack.
The diatomic bromine molecule has instantaneous dipole-dipole moments (or wan der waals forces) thus making one end partially negative. I assume that a nucleophilic substitution reaction would ensue in which the bromine atom would replace the amino group. And then the remaining bromine atom would combine with the NH2 to form NH2BR.

Not totally sure whether that's right but it seems the most logical way forth from my perspective... if that's any help?

Also I think I can get to that ester using diethylamine and an acyl compound but I'm not too sure what the reverse is....


The above is an educated guess Correct me if I'm wrong atall...

Yeah, we're supposed to use IUPAC as well, but it's just so much easier to use the common names XD Anyways, I think you're right. I tried to find more about it in my book and I think I'm supposed to make a diazonium salt, and then pull what you suggested with the Br. What I'm still not sure about is if Br2 should be used, or at least can be. I think my problem closely correlates with the Sandmeyer reaction, and that mechanism uses CuBr. Any idea why they would use that instead of Br2? As you detailed, Br2 should work.

Anyways, thanks a lot for the help! I think I can work out the placement of partial charges and e- movement from there. Don't worry about the formation of diethylamine. I think I'm supposed to use an amine to form an amide. I don't know what to do from there yet, but I think I'll figure it out with some more time.

 

[JosephG]

There's a virtually unlimited amount of ways to synthesise different compounds (as I'm sure you know like )

I think you could form that compound in many many different ways using different mechanisms and therefore each would have different intermediate states. Like you said - perhaps the mechanism your exam boards specification wants is a diazonium compound which is formed as an intermediate .
I can offer my limited knowledge and suggestions based on the broad subject of chemistry and of the specification I have learnt but I think it would be best if you use your specification
Because you may well be able to form it using Br2 and/or CuBr or with any number of nucleophilic compounds but your exam boards specification will probably want a specific way of forming it... if you catch my drift...

If it's any help I know how to form diethylamine using excess ammonia and a haloalkane? Or via nucleophilic substitution of a haloalkane by cyanide and then reduction by catalytic hydrogenation?

Anyway now you have me interested Are you studying chemistry at university or high school (I think it's called in America)?

 

[DanFC]

There's a virtually unlimited amount of ways to synthesise different compounds (as I'm sure you know like )

I think you could form that compound in many many different ways using different mechanisms and therefore each would have different intermediate states. Like you said - perhaps the mechanism your exam boards specification wants is a diazonium compound which is formed as an intermediate .
I can offer my limited knowledge and suggestions based on the broad subject of chemistry and of the specification I have learnt but I think it would be best if you use your specification
Because you may well be able to form it using Br2 and/or CuBr or with any number of nucleophilic compounds but your exam boards specification will probably want a specific way of forming it... if you catch my drift...

If it's any help I know how to form diethylamine using excess ammonia and a haloalkane? Or via nucleophilic substitution of a haloalkane by cyanide and then reduction by catalytic hydrogenation?

Anyway now you have me interested Are you studying chemistry at university or high school (I think it's called in America)?

Yeah, I think you're right about the various routes; don't worry about trying to form it a different way, I think I've got it the way they want me to do it, finally XD But a nucleophillic sub. of H-X by CN followed by H2/Pd makes the most sense, I wish I could just memorize it that way :-/

And this is organic chemistry at the university level. My last semester of it too. But gah, I got biochemistry coming up. What about you?

 

[Dronee]

Have you already seen an allergist to find out what you're reacting to? I'm looking to get an appointment with a specialist myself soon. I have constant sinus problems myself, and it really blows.

No money unfortunately... and I don't think I can get any subsidies either. I suspect it's dust mites, but I can't be sure.

Lol: Lonely Maths thread!!!

 

[JosephG]

Yeah, I think you're right about the various routes; don't worry about trying to form it a different way, I think I've got it the way they want me to do it, finally XD But a nucleophillic sub. of H-X by CN followed by H2/Pd makes the most sense, I wish I could just memorize it that way :-/

And this is organic chemistry at the university level. My last semester of it too. But gah, I got biochemistry coming up. What about you?

I'll answer you in the other thread

 

[kihira]

I'm serious about this question. I'll put it up on yahoo answers and other sites, but I wonder if anyone knows the answer to the above... Basically, I want to know how to clear a continually stuffy nose. I've read that saline solutions and 'nasal irrigation' are supposed to be the best methods... any ideas?

I make my own saline spray and it works wonders when I need it. I had constant stuffy nose problems that ended up being caused by long-term use of the medicated spray I was using - it would clear my nose temporarily then make it worse. Chili tends to make my nose run rather than stuff it up.

 

[Dronee]

I make my own saline spray and it works wonders when I need it. I had constant stuffy nose problems that ended up being caused by long-term use of the medicated spray I was using - it would clear my nose temporarily then make it worse. Chili tends to make my nose run rather than stuff it up.

Hey thanks for sharing. How does that work? Just add salt to normal water?

 

[Dronee]

Ah, okay. If the fly isn't moving independently of the bus, it will stay in the center of the bus so long as the speed and direction of the bus remain constant.

It's the same as riding in a car. If you're going 90 miles an hour in a straight line, you won't feel anything. But if the car hits a cement block and suddenly stops, your momentum will throw you forward. If the car speeds up, you feel pushed back. Car turns left, you're pushed right, and so on.

Hmm... what about a fly who is right at the window between the bus and "outside the bus"? And as it moves nearer and nearer to the "outside of the bus"? Argh... Ok.. I'm not going to look at the other science questions hehe... I'm serious though about the stuffy nose thing... if you've experiences that helped you... feel free to share. Thanks

 

[kihira]

Hey thanks for sharing. How does that work? Just add salt to normal water?

Yeah, I add sea salt into warm water until it taste like sea water. Mix it and keep it into an empty soda bottle. Use an empty nasal spray bottle to squirt. There was some research done about salt water improving recovery time from colds.

 

[NathanielWingatePeaslee]

Hmm... what about a fly who is right at the window between the bus and "outside the bus"? And as it moves nearer and nearer to the "outside of the bus"? Argh... Ok.. I'm not going to look at the other science questions hehe... I'm serious though about the stuffy nose thing... if you've experiences that helped you... feel free to share. Thanks

The proximity to the bus doesn't actually matter, just the relative speed and direction to the bus. Something inside the bus is likely to have the same simply because it was carried by the bus.

I'm currently eating some very spicy scrambled eggs which are helping my nose a bit. ::

 

[ikbenrifi]

Ah, okay. If the fly isn't moving independently of the bus, it will stay in the center of the bus so long as the speed and direction of the bus remain constant.

It's the same as riding in a car. If you're going 90 miles an hour in a straight line, you won't feel anything. But if the car hits a cement block and suddenly stops, your momentum will throw you forward. If the car speeds up, you feel pushed back. Car turns left, you're pushed right, and so on.

Thanks for your answer ! it was satisfactory

 

[SweetCupcake]

.................................

 

[SweetCupcake]

It's ok, I did them and got them all wrong::

 

[Dronee]

Drones drones drones

 

[Dronee]

Drones drones drones