[Dhooy77]

I need to come up with structures from the data given.  I really don't know where to start and would really appreciate assistance.  So I need to (1) draw the product(s) for each set of reactants listed below (2) note and explain any structural and color differences between the dyes. 

Here's the information:

Student       Diazo Component        Coupling Agent
1                   Sulfanilic acid                 Resorcinol
2                   p-Nitroaniline                  Resorcinol     
3                   Sulfanilic acid                  Phenol
4                    p-Nitroaniline                  Phenol
5                    Sulfanilic acid                  N,N-Dimethylaniline
6                    m-Nitroaniline                  Phenol
7                    m-Nitroaniline                  N,N- Dimethylaniline

8                     Sulfanilic acid                 N-Methylaniline
9                     m-Nitroaniline                 N-Methylaniline                           


( Continuation from top) Color of Dye      Wavelength λmax (nm)
Student 1                         orange                  400
2                         cherry chocolate brown        425
3                         rust                                        360
4                          cherry brownies                    not available
5                          rich dirt brown                       not available
6                          dark maroon                          700
7                red velvet cake dark brown              420
8                          pale yellow                             335
9                          rusty dark orange                 745

Any advice?  I really am totally lost.  Thanks!

[kriggy]

Ok basicaly the reaction is a coupling reaction between diazo compound and the other one which has to be activated towards electrophilic substitution.
So if we start with resorcinol, which position will be activated towards electrophilic substitution?

[Dhooy77]

The ortho/para position? 

[Dhooy77]

Sorry this is due on Monday. I'm freaking out.  What does the diazo component, coupling agent, color and wavelength all signal? 

[billnotgatez]

The members who answer questions follow the forum rules
http://www.chemicalforums.com/index.php?topic=65859.0
So they will try to teach you rather than dump an answer on you
Also they are volunteers so it may take some time

[Dhooy77]

I'm not looking for the answer.  I'm looking for some explanation.  I'm really confused with this.  I guess I don't understand the important of the dizao component, coupling agent, color of dye and wavelength.  How is this useful? 

[kriggy]

Ah they didnt give you the dye but rather the components which react together to form the dye.
here is some example of dye:

Its orange II.
As you can see, you can divide it to diazo compound and the coupling agent like this


So what is the structure of the product, when you react the diazo compound and coupling agent you have in your task?
Note your teacher didnt give you diazo compound but rather amino compound so you have to convert it into diazonium salt first.
THen when you will have all the structures, you can look at the structures and aswer the question about colour and wavelenght

[Dhooy77]

Is this just an example or a possible product for the first reaction? 

[Dhooy77]

How'd you get the extra ring from Resoricinol?  I'm confused?  Was this for student 1? 

[Dhooy77]

How are the wavelength and color helpful?

[kriggy]

1) it was just an example how similar compound looks like, its not product of the 1st or other reactin you have in your list
2) Mostl likely, coloud and wavelenght wont help you