Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: xshadow on September 08, 2021, 03:26:08 AM
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Hi!!
I would know the right molecule assocoated to tjis mass mass spectrum
Is there a site that can give me the right molecule ???
Thanks
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Here are some thoughts. You can sometimes apply the rule of 12 and the nitrogen rule to good effect. Try subtracting the mass of a fragment from M. More specifically, your spectrum has an unusual feature. I am only familiar with two functional groups that often display this feature (there might be others). Identifying likely functional groups might cut the territory down.
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Here are some thoughts. You can sometimes apply the rule of 12 and the nitrogen rule to good effect. Try subtracting the mass of a fragment from M. More specifically, your spectrum has an unusual feature. I am only familiar with two functional groups that often display this feature (there might be others). Identifying likely functional groups might cut the territory down.
Hi Babcock !!
Usually the -1 loss with an high peak is an aldehyde...
But I also see a -18 loss (water) that I think is typical of alcahol and carboxylic acid (perhaps COOH gives -17 not 18)....I also see a -28 loss so there sould be a C=O!
Also I see a 76 instad a 77...can it mean that the ring has two substituents? maybe an aldehyde and an alcohol??
PS: I also see that when I loss the aldehydic group (29) I get 93, that should be phenyl + alcohol.
THANKS
PS: what do you mean with nitrogen rule? That if M+* is even I don't have nitroger or at least 2N/4N ecc ??
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Other functional groups with a substantial M-1 are alkynes and some amines and alcohols. I would subtract the mass of the heteroatom(s) and apply the rule of 12.
When there are an odd number of nitrogens, the value of M is a odd number.