Problems of the month 2020

Hint

The "splitting" of one carbon signal might be helpful.

Hint

If available, starting with the HSQC is always a good idea.

Hint

It might sound a little bit boring: if available, start with the HSQC.

Hint

You should have heared the words "chirality" and "diastereotopic" in advance.

Hint

You should have heared the words "chirality" and "diastereotopic" in advance.