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2-carene and 3-carene

2-carene and 3-carene - Mass Spectrometry Forum

2-carene and 3-carene - Discuss and post questions about LC-MS, Q-STAR, MALDI-TOF, and other Mass Spectrometry Questions in the Mass Spec Forum.


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Old 02-18-2009, 03:07 AM
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Default 2-carene and 3-carene



So I have the two spectra for these molecules. They are fairly the same except for the peak of m/z 121, which is a m-15 peak...meaning it loses a methyl group...or at least that is my assumption. What I don't understand is why it is a strong peak for 2-carene and a weak peak for 3-carene. Any advice would be appreciated!
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Old 02-18-2009, 06:21 AM
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Default Re: 2-carene and 3-carene

Quote:
Originally Posted by juicyFruit View Post
So I have the two spectra for these molecules. They are fairly the same except for the peak of m/z 121, which is a m-15 peak...meaning it loses a methyl group...or at least that is my assumption. What I don't understand is why it is a strong peak for 2-carene and a weak peak for 3-carene. Any advice would be appreciated!
2-carene

3,7,7-Trimethylbicyclo[4.1.0]hept-2-ene
--
3-carene

3,7,7-Trimethylbicyclo[4.1.0]hept-3-ene

1. check lot no's - synthetic routes may differ
2. check reagent stability of 2 -vs- 3-carene
3. assume the m=15 is something other than CH3
4. assume the position of the double-bond is significant
5. perform an accurate net-sum comparison of peaks
6. perform instrument maintenance and test for bias
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Old 02-19-2009, 03:59 PM
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Default Re: 2-carene and 3-carene

Well I tried the Reverse-Diels Adler mechanism on the two...and it doesn't work for the 2-carene...is that what you mean by assumnig the position of the double-bond is significant? I am not sure what that tells you about the 121 peak . The m-15 peak has to be a methyl group loss...unless you lose 15 H's??
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2carene , 3carene


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