When writing out the ratios from the amounts of hydrogens in each environment, do the number have to be in a certain order, like from one end of the molecule to another, or in an order relative to where they appear on the spectrum?
proton NMR Watch
- Thread Starter
- 21-01-2010 20:43
- 21-01-2010 21:00
This is also a chapter I'm struggling on and cba to read. I'll do it soon though.
- 21-01-2010 21:03
They don't have to be an order as such, but they must correlate to the shift values.
- 21-01-2010 21:07
There's no set rule for this. I could look at the structure of ethyl acetate first, CH3COOCH2CH3, and say I'm looking for integrations of 3 : 2 : 3 on the spectrum. But if you look at the spectrum first you could say the peaks on the spectrum have relative integrations of 2 : 3 : 3 and then try and match those to the protons in the molecule. In the end I guess it doesn't really matter as long as what you've done is clear but I can't speak for your exam board.