Advanced Organic Chemistry: Mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene)

Scroll down and take time to study the content and/or follow links or [Use the website search box]

The mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene)

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 mass spectra of 3-methylbut-1-ene (3-methyl-1-butene)

email doc brown

Use your mobile phone or ipad etc. in 'landscape' mode

This is a BIG website, you need to take time to explore it

Mass spectroscopy - spectra index

C5H10 mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene) fragmentation pattern of m/z m/e ions for analysis and identification of 3-methylbut-1-ene (3-methyl-1-butene) image diagram doc brown's advanced organic chemistry revision notes 

3-methylbut-1-ene C5H10, alkenes structure and naming (c) doc b, alkenes structure and naming (c) doc b, alkenes structure and naming (c) doc b

Interpreting the fragmentation pattern of the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene)

[M]+ is the molecular ion peak (M) with an m/z of 70 corresponding to [C5H10]+, the original 3-methylbut-1-ene (3-methyl-1-butene) molecule minus an electron, [H2C=CHCH(CH3)2]+.

The small M+1 peak at m/z 71, corresponds to an ionised 3-methylbut-1-ene (3-methyl-1-butene) molecule with one 13C atom in it i.e. an ionised 3-methylbut-1-ene (3-methyl-1-butene) molecule of formula 13C12C4H10

Identifying the species giving the most prominent peaks (apart from M) in the fragmentation pattern of 3-methylbut-1-ene (3-methyl-1-butene).

m/z value of [fragment]+ 69 56 55 43 42 41 39 29 27
[molecular fragment]+ [C5H9]+ [C4H8]+ [C4H7]+ [C3H7]+ [C3H6]+ [C3H5]+ [C3H3]+ [C2H5]+ [C2H3]+

Analysing and explaining the principal ions in the fragmentation pattern of the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene).

Equations to explain the most abundant ion peaks of 3-methylbut-1-ene (3-methyl-1-butene)

Formation of m/z 69 ion: [H2C=CHCH(CH3)2]+  ===>  [C5H9]+  +  H

Loss of a proton from various sites on the molecule

Formation of m/z 55 ion: [H2C=CHCH(CH3)2]+  ===>  [C4H7]+  +  CH3

The m/z 55 ion is the base peak ion, the most abundant and 'stable' ion fragment and formed by the loss of a methyl group from the parent molecular ion (70 - 15 = 55).


Key words & phrases: C5H10 image diagram on how to interpret and explain the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene) m/z m/e base peaks, image and diagram of the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), details of the mass spectroscopy of 3-methylbut-1-ene (3-methyl-1-butene),  low and high resolution mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), prominent m/z peaks in the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), comparative mass spectra of 3-methylbut-1-ene (3-methyl-1-butene), the molecular ion peak in the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), analysing and understanding the fragmentation pattern of the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), characteristic pattern of peaks in the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), relative abundance of mass ion peaks in the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), revising the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), revision of mass spectroscopy of 3-methylbut-1-ene (3-methyl-1-butene), most abundant ions in the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), how to construct the mass spectrum diagram for abundance of fragmentation ions in the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), how to analyse the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene), how to describe explain the formation of fragmented ions in the mass spectra of 3-methylbut-1-ene (3-methyl-1-butene) equations for explaining the formation of the positive ions in the fragmentation of the ionised molecule of 3-methylbut-1-ene (3-methyl-1-butene) recognising the base ion peak of 3-methylbut-1-ene (3-methyl-1-butene) interpreting interpretation the mass spectrum of 3-methylbut-1-ene (3-methyl-1-butene) C5H10


Links associated with 3-methylbut-1-ene (3-methyl-1-butene)

The chemistry of ALKENES revision notes INDEX

Mass spectroscopy index

ALL SPECTROSCOPY INDEXES

All Advanced Organic Chemistry Notes

Use My Google search site box

Email doc b: chem55555@hotmail.com

 Doc Brown's Chemistry 

*

TOP OF PAGE