how to prepare some composes from benzene?

[ruaque]

Help me , please. how to prepare these compose from benzene:

 

1,4-dibromobenzene

1,4-dinitrobenzene

C6H5-CH2NH2

acid m-bromobenzoic

5-phenyl-2-metylphenol

 

merci beaucoup!

[chuinhen]

anyone can provide a helping hand !!!!

 

Im interested to know the answer also !!!??

[Tartaglia]

1,4 dibromobenzene can be made by direct Friedel Krafts halogenation, but it would have to be separated from the ortho product.

para dinitrobenzene would have to be made in a roundabout fashion eg using the sandmeyer reaction as nitro is a meta director

 

C6H6 ---> C6H5NO2 ---> C6H5NH2 ---> p + o C6H4(NO2)(NH2)

 

p-C6H4(NO2)(NH2) ---> p-C6H4(NO2)(N2)+ ---> p-C6H4(NO2)2

 

For C6H5CH2NH2, direct chloro methylation can be carried out using HCHO +HCl with a ZnCl2 catalyst will give benzylchloride which will easily undergo SN1 displacement by NH3

 

m-C6H4BrCO2H can got from the Gatterman Koch formylation of benzene to produce benzaldehyde, followed by oxidation followed by Friedel Krafts bromination

 

The last one I'll have to think about