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Advanced Organic Chemistry: Mass spectrum of Pent-1-ene (1-pentene)

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Mass spectrum of Pent-1-ene (1-pentene)

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 pent-1-ene

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Mass spectroscopy - spectra index

image diagram mass spectrum of pent-1ene 1-pentene fragmentation pattern of ions for analysis and identification of pent-1ene 1-pentene  doc brown's advanced organic chemistry revision notes

Pent-1-ene, alkenes structure and naming (c) doc b , alkenes structure and naming (c) doc b , alkenes structure and naming (c) doc b (1-pentene)

Interpreting the mass spectrum of pent-1-ene

[M]+ is the molecular ion peak (M) with an m/z of 70 corresponding to [C5H10]+, the original molecule minus an electron, [CH3CH2CH2CH=CH2]+.

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

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

m/z value of [fragment]+ 55 42 41 39 29 27
molecular fragment C4H7 C3H6 C3H5 C3H3 CH3CH2 C2H3

Explaining the principal fragments

m/z 55 formed by loss of methyl group from C-C bond scission of the molecular ion

 [C5H10]+ ===>  [C5H10]+  +  CH3

mass change 70 - 15 = 55

m/z 41 formed by loss of ethyl group from C-C bond scission of the molecular ion

 [C5H10]+ ===>  [C3H5]+  +  CH2CH3

mass change 70 - 29 = 41

 


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