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Advanced Organic Chemistry: 1H NMR spectrum of 1,2-dibromoethane

The H-1 hydrogen-1 (proton) NMR spectrum of 1,2-dibromoethane

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 1,2-dibromoethane

C2H4Br2 BrCH2CH2Br low and high resolution 1H proton nmr spectrum of 1,2-dibromoethane analysis interpretation of chemical shifts ppm spin spin line splitting diagram H1 H-1 nmr for 1,2-dibromoethane 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 - 1,2-dibromoethane here.

The chemical shifts quoted in ppm on the diagram of the H-1 NMR spectrum of 1,2-dibromoethane 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 1,2-dibromoethane molecule.

1,2-dibromoethaneC2H4Br2 BrCH2CH2Br2

Interpreting the H-1 NMR spectrum of 1,2-dibromoethane

In terms of spin-spin coupling from the possible proton magnetic orientations, for 1,2-dibromoethane I have only considered the interactions of non-equivalent protons on adjacent carbon atoms - but non here.

BrCH2CH2Br2

1,2-dibromoethane is a symmetrical molecule and the four hydrogen atoms are in an identical chemical environment.

The four hydrogen atoms are all equivalent to each other and no splitting is observed.

DO NOT think the high resolution spectrum consists of one or two triplets.

The high resolution 1H NMR spectrum of 1,2-dibromoethane


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: C2H4Br2 BrCH2CH2Br Interpreting the proton H-1 NMR spectra of 1,2-dibromoethane, low resolution & high resolution proton nmr spectra of 1,2-dibromoethane, H-1 nmr spectrum of 1,2-dibromoethane, understanding the hydrogen-1 nmr spectrum of 1,2-dibromoethane, explaining the line splitting patterns from spin-spin coupling  in the high resolution H-1 nmr spectra of 1,2-dibromoethane, revising the H-1 nmr spectrum of 1,2-dibromoethane, proton nmr of 1,2-dibromoethane, ppm chemical shifts of the H-1 nmr spectrum of 1,2-dibromoethane, 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 1,2-dibromoethane, how to work out the number of chemically different protons in the structure of the 1,2-dibromoethane organic molecule, how to analyse the chemical shifts in the hydrogen-1 H-1 proton NMR spectrum of 1,2-dibromoethane using the n+1 rule to explain the spin - spin coupling ine splitting in the proton nmr spectrum of 1,2-dibromoethane deducing the nature of the protons from the chemical shifts ppm in the H-1 nmr spectrum of 1,2-dibromoethane examining the 1H nmr spectrum of  1,2-dibromoethane analysing the 1-H nmr spectrum of 1,2-dibromoethane how do you sketch and interpret the H-1 NMR spectrum of 1,2-dibromoethane interpreting interpretation of the 1H proton spin-spin coupling causing line splitting in the NMR spectrum of 1,2-dibromoethane  assignment of chemical shifts in the proton 1H NMR spectrum of 1,2-dibromoethane formula explaining spin-spin coupling for line splitting


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