The O-H peak of BINOL in 1H-NMR (CDCl3) shows nearly 5ppm. The Proton must be desheilded even though why the peak comes in the down field?

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Ian A Cade

Hydrogen bonding can mean OH groups give fairly low field resonances.

And in the particular case of using DMSO as a solvent, it seems that BINOL is really quite acidic (see reference below):

http://pubs.rsc.org/-/content/articlehtml/2016/qo/c6qo00252h#cit1b

Wolfgang Baumann

5-6 ppm is the characteristic characteristic chemical shift range for phenolic OH groups

John Anyam

I agree with Wolfgang Bauman.