November 27, 2024, 03:43:54 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: NMR spectrum of conjugated carbonyl  (Read 1954 times)

0 Members and 1 Guest are viewing this topic.

Offline Staccato09

  • New Member
  • **
  • Posts: 3
  • Mole Snacks: +0/-0
NMR spectrum of conjugated carbonyl
« on: January 23, 2014, 12:05:02 AM »
In a conjugated carbonyl, why does the vinyl hydrogen closest to the carbonyl absorb more upfield than than the vinyl hydrogen farthest from the carbonyl? Shouldnt the vinyl hydrogen closest to the carbonyl be more deshielded? Thank you!
Logged

Offline clarkstill

  • Chemist
  • Full Member
  • *
  • Posts: 477
  • Mole Snacks: +77/-4
Re: NMR spectrum of conjugated carbonyl
« Reply #1 on: January 23, 2014, 02:52:11 AM »
Think about the resonance forms of an unsaturated carbonyl group... why do electrophiles attack at the beta position rather than the alpha?
Logged

Offline Staccato09

  • New Member
  • **
  • Posts: 3
  • Mole Snacks: +0/-0
Re: NMR spectrum of conjugated carbonyl
« Reply #2 on: January 23, 2014, 11:59:32 PM »
Ah! That makes sense. Thanks!
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links