How would you find out the singlet, doublet etc peaks of a compund?

[mouthcracker]

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I know the formula n+1...
n = number of neighbouring hydrogens..

But it doesnt wok all the time...i.e. m-xylene has four peaks - two singlet, one doublet, one triplet!!!!!

 

[Streetwolf]

If I recall correctly...

One singlet is the H on the C inbetween the two methyl group C's (C # 2). The adjacent carbons each have 0 H's.

Another singlet are the H's on the methyl C's... there are no H's on any adjacent C's.

The doublet comes from C #4 and 6. Their adjacent C's each have one H.

The triplet comes from C #5. The two adjacent C's each have 1 carbon, so 1x2 = 2. Then the n+1 rule says 3.

 

[nate28]

If I recall correctly...

One singlet is the H on the C inbetween the two methyl group C's (C # 2). The adjacent carbons each have 0 H's.

Another singlet are the H's on the methyl C's... there are no H's on any adjacent C's.

The doublet comes from C #4 and 6. Their adjacent C's each have one H.

The triplet comes from C #5. The two adjacent C's each have 1 carbon, so 1x2 = 2. Then the n+1 rule says 3.

BOO-YA!!
That's how it's done!!