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Chemistry Forums for Students => Organic Chemistry Forum => Organic Spectroscopy => Topic started by: bares1207 on April 02, 2016, 09:30:23 AM

Title: 3-Hydroxy-4-nitrobenzaldehyde Mass spec base peak?
Post by: bares1207 on April 02, 2016, 09:30:23 AM

molecular mass of this compound is 167 and m/z is therefore also 167. However in my spectrum there's a base peak with m/z of 137. I just can't see what group can leave that will reduce the m/z by 30. If you remove CHO that removes 29 from 169. I've tired all sorts of re-arrangements with neighboring H atoms but I just cant do it. Any ideas what the structure of this ion with m/z = 137 could be?

Title: Re: 3-Hydroxy-4-nitrobenzaldehyde Mass spec base peak?
Post by: Burner on April 02, 2016, 09:39:00 AM

http://www.chemicalforums.com/index.php?topic=84846.0

Not sure if this helps

Title: Re: 3-Hydroxy-4-nitrobenzaldehyde Mass spec base peak?
Post by: bares1207 on April 02, 2016, 10:06:37 AM

thanks for the reply but I'm afraid not :( the reply on that post just said basically in short "I'm not helping you" haha

Title: Re: 3-Hydroxy-4-nitrobenzaldehyde Mass spec base peak?
Post by: discodermolide on April 02, 2016, 12:35:35 PM

perhaps a base peak + H?

Title: Re: 3-Hydroxy-4-nitrobenzaldehyde Mass spec base peak?
Post by: MOTOBALL on April 04, 2016, 06:39:09 PM

Facile loss of 30 amu is characteristic of the loss of NO from molecules that contain a nitro group.
BTW, were you 'tezzapot' about 3 weeks ago, with the same question?