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Chemistry Forums for Students => Organic Chemistry Forum => Organic Spectroscopy => Topic started by: user5433 on January 16, 2013, 11:04:32 AM

Title: Identifying compounds through IR spectra
Post by: user5433 on January 16, 2013, 11:04:32 AM

Hi, I was wondering if a kind soul could check my answers regarding these spectra.
https://www.dropbox.com/s/6cn39crjllts3bd/untitled.docx
 (https://www.dropbox.com/s/6cn39crjllts3bd/untitled.docx)

A) phenyl group with OH and ether attached to it
B) phenyl group attached to an ester
C) phenyl group attached to methyl group and C triple bonded to CH
D) CH3-(CH2)6-C (double bonded to O) -OH
E) phenyl group bonded to NH2

Thanks in advance.  I have already done the labeling and such and just wanted to confirm.

Title: Re: Identifying compounds through IR spectra
Post by: Schrödinger on January 17, 2013, 01:04:10 PM

Seems fine to me. Although I'm not sure about the 1st sure about the first one. All bands seem to be lesser than 3000 cm_-1, and hence aliphatic.

Title: Re: Identifying compounds through IR spectra
Post by: ashmus on January 17, 2013, 02:34:51 PM

Hi user5433. You may want to double check B again too. You have some peaks at ~2800 and ~2750 that support one functional group over another.

Title: Re: Identifying compounds through IR spectra
Post by: user5433 on January 17, 2013, 03:32:36 PM

Quote from: ashmus on January 17, 2013, 02:34:51 PM

Hi user5433. You may want to double check B again too. You have some peaks at ~2800 and ~2750 that support one functional group over another.

Thanks.  I realized B is h3c-benzene-aldehyde.

Also C is the other compound with the c-c triple bonds since there are no aromatic stretches.