HOME PAGE * KS3 SCIENCES * GCSE BIOLOGY CHEMISTRY PHYSICS * ADVANCED LEVEL CHEMISTRY

SPECTROSCOPY INDEXES  *  All Advanced Organic Chemistry Notes  *  [SEARCH BOX]

Advanced Organic Chemistry: 1H NMR spectrum of 3-ethylpentane

The H-1 hydrogen-1 (proton) NMR spectrum of 3-ethylpentane

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 3-ethylpentane

See also comparing the 1H NMR and 13C NMR spectra of the nine alkane structural isomers of C7H16

C7H16 low and high resolution 1H proton nmr spectrum of 3-ethylpentane analysis interpretation of chemical shifts ppm spin spin line splitting diagram H1 H-1 nmr for 3-ethylpentane 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 - 3-ethylpentane here.

The chemical shifts quoted in ppm on the diagram of the H-1 NMR spectrum of 3-ethylpentane 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 3-ethylpentane molecule.

3-ethylpentane alkanes structure and naming (c) doc b alkanes structure and naming (c) doc b alkanes structure and naming (c) doc b alkanes structure and naming (c) doc b

For more see The molecular structure, classification and naming of alkanes

Interpreting the H-1 NMR spectrum of 3-ethylpentane

For relatively simple molecules, the low resolution H-1 NMR spectrum of 3-ethylpentane is a good starting point (lower and higher resolution diagrams above).

The hydrogen atoms (protons) of 3-ethylpentane occupy 3 different chemical environments so that the low resolution NMR spectra should show 3 principal peaks of different H-1 NMR chemical shifts (diagram above for 3-ethylpentane).

(CH3CH2)3CH

Note the proton ratio 9:6:1 of the 3 colours of the protons in the 3 chemically different environments

Chemical shifts (a) to (c) on the H-1 NMR spectrum diagram for 3-ethylpentane.

Although there are 16 hydrogen atoms in the molecule, there are only 3 possible different chemical environments for the hydrogen atoms in 3-ethylpentane molecule.

The integrated signal proton ratio 9:6:1 observed in the high resolution H-1 NMR spectrum, corresponds with the structural formula of 3-ethylpentane.

The high resolution 1H NMR spectrum of 3-ethylpentane

All low and high resolution spectra of 3-ethylpentane show 3 groups of proton resonances and in the 9:6:1 ratio expected from the formula of 3-ethylpentane.

The ppm quoted on the diagram represent the peak of resonance intensity for a particular proton group in the molecule of 3-ethylpentane - since the peak' is at the apex of a band of H-1 NMR resonances due to spin - spin coupling field splitting effects - see high resolution notes on 3-ethylpentane below.

So, using the chemical shifts and applying the n+1 rule to 3-ethylpentane and make some predictions using some colour coding! (In problem solving you work the other way round!)

(a) 1H Chemical shift 0.84 ppm, CH3 protons:(CH3CH2)3CH

This 1H resonance is split into a 1:2:1 triplet by the adjacent CH2 protons (n+1 = 3)

Evidence for the presence of a CH2 group in the molecule of 3-ethylpentane

(b) 1H Chemical shift 1.28 CH2 protons:(CH3CH2)3CH

This 1H resonance is split into a 1:4:6:4:1 quintet by adjacent CH3 and CH protons on either side (n+1 = 5)

Evidence for the presence of a CH3-C-CH grouping in the molecule of 3-ethylpentane

(c) 1H Chemical shift 1.09 ppm, CH protons:(CH3CH2)3CH

This 1H resonance is split into a septet by three lots of adjacent CH2 protons (n+1 = 7)


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

Comparing the 1H NMR and 13C NMR spectra of the nine alkane structural isomers of C7H16

You can distinguish all 9 isomers from a data combination of their number of 1H NMR chemical shifts,

and their resulting integrated 1H proton ratios, plus, their number of 13C chemical shifts.

Name of the alkane structural isomer of molecular formula C7H16 Abbreviated structural formulae of the nine isomers of molecular formula C7H16 (interpretation complications with 3-methylhexane and 2,3-dimethylpentane because they exhibit R/S isomerism due to a chiral carbon) Skeletal formula of the nine alkane isomers of  molecular formula C7H16 Number of 1H NMR chemical shifts (δ) and proton ratio (links to spectrum) Number of 13C chemical shifts (δ) (links to spectrum)
heptane structural formula skeletal formula alkanes molecular structure naming (c) doc b heptane skeletal formula alkanes molecular structure naming (c) doc b 4 δ: proton ratio: 3:2:2:1 (6:4:4:2 in the molecule) 4 δ shifts
2-methylhexane structural formula skeletal formula alkanes molecular structure naming (c) doc b 2-methylhexane skeletal formula alkanes molecular structure naming (c) doc b 6 δ: proton ratio : 6:3:2:2:2:1 6 δ shifts
3-methylhexane structural formula skeletal formula alkanes molecular structure naming (c) doc b 3-methylhexane skeletal formula alkanes molecular structure naming (c) doc b 7 δ: proton ratio: 3:3:3:2:2:2:1 (simplification) !!! 7 δ shifts
3-ethylpentane structural formula skeletal formula alkanes molecular structure naming (c) doc b 3-ethylpentane skeletal formula alkanes molecular structure naming (c) doc b 3 δ: proton ratio: 9:6:1 3 δ shifts
2,2-dimethylpentane structural formula skeletal formula alkanes molecular structure naming (c) doc b 2,2-dimethylpentane skeletal formula alkanes molecular structure naming (c) doc b 4 δ: proton ratio: 9:3:2:2 5 δ shifts
2,3-dimethylpentane structural formula skeletal formula alkanes molecular structure naming (c) doc b 2,3-dimethylpentane skeletal formula alkanes molecular structure naming (c) doc b 6 δ: proton ratio: 6:3:3:2:1:1 (simplification) !!! 6 δ shifts (simplification) !!!
2,4-dimethylpentane structural formula skeletal formula alkanes molecular structure naming (c) doc b 2,4-dimethylpentane skeletal formula alkanes molecular structure naming (c) doc b 3 δ: proton ratio: 12:2:2 3 δ shifts
3,3-dimethylpentane structural formula skeletal formula alkanes molecular structure naming (c) doc b 3,3-dimethylpentane skeletal formula alkanes molecular structure naming (c) doc b 3 δ: proton ratio: 3:3:2 (6:4:4 in the molecule) 4 δ shifts
2,2,3-trimethylbutane structural formula skeletal formula alkanes molecular structure naming (c) doc b 2,2,3-trimethylbutane skeletal formula alkanes molecular structure naming (c) doc b 3 δ: proton ratio: 9:6:1 4 δ shifts

Key words & phrases:C7H16 Interpreting the proton H-1 NMR spectra of 3-ethylpentane, low resolution & high resolution proton nmr spectra of 3-ethylpentane, H-1 nmr spectrum of 3-ethylpentane, understanding the hydrogen-1 nmr spectrum of 3-ethylpentane, explaining the line splitting patterns in the high resolution H-1 nmr spectra of 3-ethylpentane, revising the H-1 nmr spectrum of 3-ethylpentane, proton nmr of 3-ethylpentane, ppm chemical shifts of the H-1 nmr spectrum of 3-ethylpentane, 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 3-ethylpentane, how to work out the number of chemically different protons in the structure of the 3-ethylpentane organic molecule, how to analyse the chemical shifts in the hydrogen-1 H-1 proton NMR spectrum of 3-ethylpentane using the n+1 rule to explain the spin - spin coupling ine splitting in the proton nmr spectrum of 3-ethylpentane deducing the nature of the protons from the chemical shifts ppm in the H-1 nmr spectrum of 3-ethylpentane examining the 1H nmr spectrum of  3-ethylpentane analysing the 1-H nmr spectrum of 3-ethylpentane how do you sketch and interpret the H-1 NMR spectrum of 3-ethylpentane interpreting interpretation of the 1H proton NMR spectrum of 3-ethylpentane (CH3CH2)3CH CH3CH2CH(CH2CH3)CH2CH3

Molecular structure diagram of the proton NMR diagram for the 1H NMR spectrum of 3-ethylpentane. The proton ratio in the 1H NMR spectrum of 3-ethylpentane. Deducing the number of different chemical environments of the protons in the 3-ethylpentane molecule from the 1H chemical shifts in the hydrogen-1 NMR spectrum of 3-ethylpentane. Analysing the high resolution 1H NMR spectrum of 3-ethylpentane. Analysing the low resolution 1H NMR spectrum of 3-ethylpentane. You may need to know the relative molecular mass of 3-ethylpentane to deduce the molecular formula from the proton ratio of the 1H NMR spectrum of 3-ethylpentane. Revision notes on the proton NMR spectrum of 3-ethylpentane. Matching and deducing the structure of the 3-ethylpentane molecule from its hydrogen-1 NMR spectrum. Proton NMR spectroscopy of aliphatic alkanes, 1H NMR spectra of 3-ethylpentane, a structural isomer of molecular formula C7H16


Links associated with 3-ethylpentane

The chemistry of ALKANES revision notes INDEX

H-1 proton NMR spectroscopy index  (Please read 8 points at the top of the 1H NMR index page)

ALL SPECTROSCOPY INDEXES

All Advanced Organic Chemistry Notes

Use My Google search site box

Email doc b: chem55555@hotmail.com

TOP OF PAGE

 Doc Brown's Chemistry 

*

TOP OF PAGE

latest video game release 1H proton NMR spectrum of 3-ethylpentane latest pop music releases 1H proton NMR spectrum of 3-ethylpentane download free music 1H proton NMR spectrum of 3-ethylpentane latest film releases 1H proton NMR spectrum of 3-ethylpentane latest high street fashion in clothes 1H proton NMR spectrum of 3-ethylpentane fashionable trending in clothing 1H proton NMR spectrum of 3-ethylpentane girls buy clothes 1H proton NMR spectrum of 3-ethylpentane spend a lot of money on clothes 1H proton NMR spectrum of 3-ethylpentane shoes 1H proton NMR spectrum of 3-ethylpentane sweets and chocolates 1H proton NMR spectrum of 3-ethylpentane magazines and make-up. Boys buy food and drink 1H proton NMR spectrum of 3-ethylpentane computer games 1H proton NMR spectrum of 3-ethylpentane DVDs and CDs 1H proton NMR spectrum of 3-ethylpentane girls and boys spend a lot of money on credit for mobile phones 1H proton NMR spectrum of 3-ethylpentane buses and trains to transport them going out. Girls spend a lot of money on clothes color colour preferences in clothes 1H proton NMR spectrum of 3-ethylpentane cool sunglasses 1H proton NMR spectrum of 3-ethylpentane boys  buy expensive things like designer sports clothes and trainers 1H proton NMR spectrum of 3-ethylpentane teenagers save for holidays 1H proton NMR spectrum of 3-ethylpentane clothes 1H proton NMR spectrum of 3-ethylpentane mobile phones 1H proton NMR spectrum of 3-ethylpentane birthday presents and electronic goods 1H proton NMR spectrum of 3-ethylpentane teenage accessories 1H proton NMR spectrum of 3-ethylpentane Favourite style of jeans. A typical girl’s shopping list includes mobile phone credit deals 1H proton NMR spectrum of 3-ethylpentane fashionable quality cool airpods 1H proton NMR spectrum of 3-ethylpentane air pods 1H proton NMR spectrum of 3-ethylpentane fashionable clothes 1H proton NMR spectrum of 3-ethylpentane the most popular favourite sneakers 1H proton NMR spectrum of 3-ethylpentane fancy shoes 1H proton NMR spectrum of 3-ethylpentane sweets 1H proton NMR spectrum of 3-ethylpentane chocolates 1H proton NMR spectrum of 3-ethylpentane magazines 1H proton NMR spectrum of 3-ethylpentane lip moisturizer  1H proton NMR spectrum of 3-ethylpentane lots on make-up 1H proton NMR spectrum of 3-ethylpentane well being 1H proton NMR spectrum of 3-ethylpentane teenage decor decorating their room 1H proton NMR spectrum of 3-ethylpentane teenagers like LED string lantern lights 1H proton NMR spectrum of 3-ethylpentane beauty products for teenagers 1H proton NMR spectrum of 3-ethylpentane denim jackets 1H proton NMR spectrum of 3-ethylpentane scrunchies coolness 1H proton NMR spectrum of 3-ethylpentane fashionable back packs 1H proton NMR spectrum of 3-ethylpentane typical boy’s shopping list includes mobile credit deals 1H proton NMR spectrum of 3-ethylpentane eating out takeaway food and drinks 1H proton NMR spectrum of 3-ethylpentane what teenagers like to buy in clothes 1H proton NMR spectrum of 3-ethylpentane computer games 1H proton NMR spectrum of 3-ethylpentane DVDs 1H proton NMR spectrum of 3-ethylpentane CDs 1H proton NMR spectrum of 3-ethylpentane what teenagers talk about 1H proton NMR spectrum of 3-ethylpentane what teenagers worry about 1H proton NMR spectrum of 3-ethylpentane what teenagers like to do for fun sports 1H proton NMR spectrum of 3-ethylpentane what cool things do teenagers buy 1H proton NMR spectrum of 3-ethylpentane resale websites like eBay Teenager education word cloud how do I apply to university to study biology? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study biology? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study biology? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study chemistry? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study chemistry? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study chemistry? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study physics? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study physics? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study physics? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study biomedical sciences? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study biomedical sciences? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study biomedical sciences 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study medicine? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study medicine? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study medicine? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study biochemistry? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study biochemistry? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study biochemistry? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study mathematics? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study mathematics? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study mathematics? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study chemical engineering? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study chemical engineering? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study chemical engineering? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study civil engineering? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study civil engineering? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study civil engineering? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study electrical engineering? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study electrical engineering? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study electrical engineering? 1H proton NMR spectrum of 3-ethylpentane how do I apply to university to study computer science? 1H proton NMR spectrum of 3-ethylpentane what courses are available at university to study computer science? 1H proton NMR spectrum of 3-ethylpentane what grades do I need to get to university to study computer science? 1H proton NMR spectrum of 3-ethylpentane