|Oct2-08, 11:00 PM||#1|
Shielding Effect and Chemical Shift
1. The problem statement, all variables and given/known data
Given a molecule of chloroethene (vinyl chloride) or ClCH=CH2. Rank the hydrogen atoms in the molecule in terms of which will have the greatest chemical shift.
2. Relevant equations
3. The attempt at a solution
Since the Cl and the double bond are both electron-rich, this affects the shielding of each proton. So to rank them, I think it could go one of two ways:
1) The proton on the Cl-CH= is the most blinded (smallest chemical shift) since it is between the two electron-rich groups, followed by the proton in the cis position to the Cl since it is slightly closer to the electronic density than the H in the trans position to the Cl.
2) The reverse order so: the H on the Cl-CH= is the least blinded (largest chemical shift) because the Cl is electronegative and is withdrawing the electron density from the H. Then the H in the cis position to the Cl would be 2nd rank in terms of blinding and then followed by the H in the trans position to the Cl (being the least blinded) because all of its electron density is being pulled toward the double bond and the Cl.
I think I'm a bit mixed up on how electronegativity works, so any help would be greatly appreciated. Thanks in advance!!
|Oct8-08, 11:07 AM||#2|
|electronegativity, shielding, shift, spectroscopy|
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