October 15, 2019, 07:23:05 AM
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Topic: Mass spectrum: 2,3-dimethylbutane peak at 55  (Read 2748 times)

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Offline Mimic

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Mass spectrum: 2,3-dimethylbutane peak at 55
« on: May 24, 2018, 06:35:58 AM »
What is the peak at 55 m/z? http://sdbs.db.aist.go.jp/sdbs/cgi-bin/img_disp.cgi?disptype=disp1&imgdir=ms&fname=MSNW1293&sdbsno=654

This is my idea

86 - 55 = 31: what can it be 31? or
secondary fragmentation from 71: 71 - 55 = 16. Can be a loss of a methane molecula? If so, what is the structure of the ion at 55?

Thanks in advance
« Last Edit: May 24, 2018, 07:51:18 AM by Mimic »

Offline pgk

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Re: Mass spectrum: 2,3-dimethylbutane peak at 55
« Reply #1 on: May 30, 2018, 12:29:19 PM »
If there is migration of an hydrogen radical, then the molecular fragment is M/z = 85.
Can this lead to a fragment m/z = 55?

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