question 5)b) the last one on proton NMR, this was my structure its the same but mark scheme does not state.
Were you given a table of chemical shifts?
The only way to distinguish between the two structures is the chemical shift of the methyl and CH2 groups.
In your structure the methyl protons would be expected at over 3 and in the exam answer at about 2, but you could only be expected to know this with a table of shifts...
The only way to distinguish between the two structures is the chemical shift of the methyl and CH2 groups.
In your structure the methyl protons would be expected at over 3 and in the exam answer at about 2, but you could only be expected to know this with a table of shifts...
do we use the chemical shifts to see what comes first? so does it go from small ppm to big ppm? thank you
I don't understand your question.
You use the chemical shifts to differentiate between the groups you have identified from the integrals and splitting pattern, or to locate them in an environment.
You have a three proton singlet at about 2.2.
This corresponds to a CH3 group attached to an atom that does not contain a hydrogen (no splitting)
You use the chemical shifts to differentiate between the groups you have identified from the integrals and splitting pattern, or to locate them in an environment.
I understand, but in a proton NMR , how can you know what comes first!Like in my example above, I did everything correctly but just done the opposite putting ester at the end.
I think I get it know is it because from the chemical shift there is HC-C=O and there is no benzene ring ?
I understand, but in a proton NMR , how can you know what comes first!Like in my example above, I did everything correctly but just done the opposite putting ester at the end.
I think I get it know is it because from the chemical shift there is HC-C=O and there is no benzene ring ?