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Advanced Organic Chemistry: 1H NMR spectrum of trimethylamine

Interpreting the H-1 hydrogen-1 (proton) NMR spectrum of N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine)

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing H-1 NMR spectra of N,N-dimethylmethanamine (trimethylamine)

1H proton nmr spectrum of N,N-dimethylmethanamine (trimethylamine) low/high resolution diagrams C3H9N (CH3)3N analysis interpretation of chemical shifts ppm spin spin line splitting diagram H1 H-1 nmr for N,N-dimethylmethylamine explaining spin-spin coupling for line splitting doc brown's advanced organic chemistry revision notes

TMS is the acronym for tetramethylsilane, formula Si(CH3)4, whose protons are arbitrarily given a chemical shift of 0.0 ppm. This is the 'standard' in 1H NMR spectroscopy and all other proton resonances, called chemical shifts, are measured with respect to the TMS, and depend on the individual (electronic) chemical environment of the hydrogen atoms in an organic molecule - N,N-dimethylmethanamine (trimethylamine) here.

The chemical shifts quoted in ppm on the diagram of the H-1 NMR spectrum of N,N-dimethylmethanamine (trimethylamine) represent the peaks of the intensity of the chemical shifts of (which are often groups of split lines at high resolution) AND the relative integrated areas under the peaks gives you the ratio of protons in the different chemical environments of the N,N-dimethylmethanamine (trimethylamine) molecule.

N,N-dimethylmethanamine, N,N-dimethylmethylamine, trimethylamine, (c) doc b ,(c) doc b

Interpreting the H-1 NMR spectrum of N,N-dimethylmethanamine (trimethylamine)

In terms of spin-spin coupling from the possible proton magnetic orientations, for N,N-dimethylmethanamine (trimethylamine) I have only considered the interactions of non-equivalent protons on adjacent carbon atoms, but this doesn't apply to trimethylamine.

All the hydrogen atoms (protons) of N,N-dimethylmethanamine (trimethylamine) occupy the same chemical environment so that the low/high resolution NMR spectra will only show one principal peak, just one 1H chemical shift at 2.12 ppm (diagram above for N,N-dimethylmethanamine (trimethylamine)).

(CH3)3N

All 9 hydrogen atoms of the three methyl groups are equivalent to each other because of the symmetry of the trimethylamine molecule - no need for the n+1 rule!


Number of directly adjacent protons 1H causing splitting Splitting pattern produced from the n+1 rule on spin-spin coupling and the theoretical ratio of line intensities
0 means no splitting             1            
1 creates a doublet           1   1          
2 creates a triplet         1   2   1        
3 creates a quartet       1   3   3   1      
4 creates a quintet     1   4   6   4   1    
5 creates a sextet   1   5   10   10   5   1  
6 creates a septet 1   6   15   20   15   6   1

Key words & phrases: isomer of C3H9N (CH3)3N N(CH3)3 Interpreting the proton H-1 NMR spectra of N,N-dimethylmethanamine (trimethylamine), low resolution & high resolution proton nmr spectra of N,N-dimethylmethanamine (trimethylamine), H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), understanding the hydrogen-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), explaining the line splitting patterns from spin-spin coupling  in the high resolution H-1 nmr spectra of N,N-dimethylmethanamine (trimethylamine), revising the H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), proton nmr of N,N-dimethylmethanamine (trimethylamine), ppm chemical shifts of the H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), explaining and analyzing spin spin line splitting in the H-1 nmr spectrum, how to construct the diagram of the H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), how to work out the number of chemically different protons in the structure of the N,N-dimethylmethanamine (trimethylamine) organic molecule, how to analyse the chemical shifts in the hydrogen-1 H-1 proton NMR spectrum of N,N-dimethylmethanamine (trimethylamine) using the n+1 rule to explain the spin - spin coupling ine splitting in the proton nmr spectrum of N,N-dimethylmethanamine (trimethylamine) deducing the nature of the protons from the chemical shifts ppm in the H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine) examining the 1H nmr spectrum of  N,N-dimethylmethanamine (trimethylamine) analysing the 1-H nmr spectrum of N,N-dimethylmethanamine (trimethylamine) how do you sketch and interpret the H-1 NMR spectrum of N,N-dimethylmethanamine (trimethylamine) interpreting interpretation of the 1H proton spin-spin coupling causing line splitting in the NMR spectrum of N,N-dimethylmethanamine (trimethylamine)  assignment of chemical shifts in the proton 1H NMR spectrum of N,N-dimethylmethanamine (trimethylamine) formula explaining spin-spin coupling for line splitting for N,N-dimethylmethanamine (trimethylamine) old names functional group tertiary aliphatic amine N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine


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