how crazy can the dat get with nmr?

[Kneecoal]

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I'm reading Kaplan, and I can understand how something like H3C-O-CHCl2 has 2 peaks, and the 3 H's on the left are all equivalent and the H on the right is on its own.

I can also understand that something like Cl2HCCHBr2 is a doublet because the H's are 3 bonds apart.

But I just don't get what they're talking about when they mention ClH2CCHBr2 and start talking about how the H on the right is affected by the 2 nearby H's on the left and can "experience 4 different states: alpha-alpha, alpha-beta, beta-alpha, or beta-beta."

and THEN it says that the result is "three peaks centered around the true chemical shift" -- what are they talking about??

--> are they just saying that it'll be a quadruplet? like it's 3 adjacent H's, so it'll be a quadruplet?

thanks peeps.
​

 

[joonkimdds]

I'm reading Kaplan, and I can understand how something like H3C-O-CHCl2 has 2 peaks, and the 3 H's on the left are all equivalent and the H on the right is on its own.
They are two singlets
I can also understand that something like Cl2HCCHBr2 is a doublet because the H's are 3 bonds apart.
a doublet? shouldn't it be a doublet and a triplet?
But I just don't get what they're talking about when they mention ClH2CCHBr2 and start talking about how the H on the right is affected by the 2 nearby H's on the left and can "experience 4 different states: alpha-alpha, alpha-beta, beta-alpha, or beta-beta."

and THEN it says that the result is "three peaks centered around the true chemical shift" -- what are they talking about??
isn't it doublet and a triplet?
--> are they just saying that it'll be a quadruplet? like it's 3 adjacent H's, so it'll be a quadruplet?

thanks peeps.
​