What is tarry oxidation products ?

What is tarry oxidation products ? oup IS less than tha o Nitration: Direct nitration of aniline eld roducts in a itionto enl o derivatives. Moreover. in the stro vaci ic anilinium ion which is meta directing. That is why besides thet defrivatives, significant amount of meta derivative is also formed. NH2 NH2 NH2 N02 N02 N02

The word tarry is used for something which stays temporarily at its place.

In context of amines, if you proceeds for direct nitration of aniline, then you will end up with a mixture of aniline and nitrobenzene.

For two reasons, direct nitration of aniline is avoided.

1. By direct nitration of aniline, we will obtain a mixture ofo, m and p nitro derivative of aniline. So it will not be a useful reaction from quality point of product.

2. Second reason is that nitric acid is not only a nitrating agent but also act as a strong oxidizing agent. So it is not useful reaction, as it often gives tarry oxidation products along with some nitration products.

Therefore, to avoid these problems, first amino group of aniline is protected by acetylation and then its nitration is done.