Welcome Guest Search | Active Topics |

Tag as favorite
Classroom Companion Review Question 5. p125
Options
Previous Topic Next Topic
Sarah_5666
#1 Posted : Wednesday, June 17, 2020 5:30:31 PM
Rank: Newbie

Groups: Registered
Joined: 5/17/2020
Posts: 3

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi, can someone please explain how there are 7 chiral centres in the molecule in this question? I thought that a chiral centre is supposed to have 4 different groups, but I feel like most of them are bound to more than one carbon. Thanks.
Back to top
Report?
INSTR_Katerina_102
#2 Posted : Wednesday, June 17, 2020 10:19:28 PM
Rank: Advanced Member

Groups: Registered
Joined: 6/24/2019
Posts: 250

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi,

Different groups do not have to mean that it is a different atom, they can also mean a different branching carbon chain. This can get tricky with fused rings like this, because you might have to trace a bit down the chain to see the difference between groups.

https://ibb.co/fM8PhXq

I've shown the logic all out here, usually for steroids like this ring junctions (places where the rings meet each other) tend to be chiral centres.

Another way I like to approach this question is through elimination - you can draw this molecule out and cross off anything that is attached to 2 Hs or is not sp3 hybridized.

Please let me know if you need clarification.
Back to top
Report?
Users browsing this topic
Guest (2)
Tag as favorite
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Clean Slate theme by Jaben Cargman (Tiny Gecko)
Powered by YAF | YAF © 2003-2009, Yet Another Forum.NET
This page was generated in 0.039 seconds.