Chemical Forums

Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: metalgearrex21 on March 27, 2019, 07:20:00 AM

Title: Chiral centres
Post by: metalgearrex21 on March 27, 2019, 07:20:00 AM

Can anyone tell me if I have labelled all the chiral centres on these excipients correctly? It's wrecking my head and I have spent so much time trying to figure it out.

https://imgur.com/a/VkXQJRY

Title: Re: Chiral centres
Post by: chenbeier on March 27, 2019, 09:35:07 AM

I think you forget the anomeric C-atom.  In Haworth description all C in the ring are chiral. In Fisher projection it is one less.

https://www.google.com/search?q=anomer+c-atom&client=firefox-b-d&tbm=isch&source=iu&ictx=1&fir=_cyv2sxoGO-HkM%253A%252C1ARqulBDqF1HoM%252C_&vet=1&usg=AI4_-kQAONe7jbwvcfbx_55QmKYRL6Nd4g&sa=X&ved=2ahUKEwjIjZfHt6LhAhXS2qQKHWD4DeQQ9QEwAHoECAsQBg#imgrc=_cyv2sxoGO-HkM:

Title: Re: Chiral centres
Post by: AWK on March 27, 2019, 12:38:09 PM

Concerning this scheme:
All carbon atoms of all hexose rings are chiral because of 4 different substituents.