Dear Mrinmoy Karmakar,

In the case of tocopherol succinate, there are no aromatic protons. The aromatic ring is fully substituted (for example of methyl groups), which is why no aromatic proton signals appear around 6.5 ppm.

Look at this link: Article Fabrication of a Charge-Conversion Polymer—Liposome for Enha...

There is 1H NMR spectrum.

Best reagrds,

This is very simple: there is no aromatic proton in Tocopherol succinate, so there are no signals in the 6.5-7.5 ppm range. The aromatic ring is completely substituted by methyl or alkyl groups and OR groups.

Yes, you are absolutely right. Thank you very much for such an eye-openning answer.