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Topic: MS of 3,4-dimethoxybenzaldehyde  (Read 4040 times)

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Offline shell52080

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MS of 3,4-dimethoxybenzaldehyde
« on: May 02, 2007, 04:41:30 PM »
The mass spec of 3,4-dimethoxybenzaldehyde shows a large M peak at 166. The next largest peak is 165 which is due to the aldehyde. Does this mean that the mass, base and parent peak are all the same?
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Offline Yggdrasil

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Re: MS of 3,4-dimethoxybenzaldehyde
« Reply #1 on: May 02, 2007, 07:11:59 PM »
Yes, if your molecular ion peak is the strongest peak in the spectrum, then your mass, base peak, and parent peak will all be the same.  (Although for 3,4-dimethoxybenzaldehyde, it seems somewhat strange that the base peak is at 166.  I would expect it to fragment more.)
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Offline shell52080

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Re: MS of 3,4-dimethoxybenzaldehyde
« Reply #2 on: May 04, 2007, 05:08:39 PM »
Thanks for your reply. 166 is definitely the only intense peak. 165 is somewhat, but that's due to the aldehyde. the other major peaks are 51, 77, 95(not exactly sure what this one is) and 151.

Thanks again!
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