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Topic: Question about HMBC  (Read 3070 times)

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Offline bonkers

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Question about HMBC
« on: January 19, 2015, 03:35:53 AM »
Hello

Can anyone explain why don't protons numbered "7" in 3,4-diaminoanisol give any HMBC crosspeaks? I'm not even sure which ones are "7"
1) 3.98 in the spectrum
2) 3.44 and 3.98 in spectrum and the integrals are bigger because of impurities
3) 4.50 (same as "8") but the integral is just smaller

Spectra:
1H

HMBC(green) HSQC (red)

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Offline Irlanur

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Re: Question about HMBC
« Reply #1 on: January 19, 2015, 06:37:32 AM »
conditions? (eg solvent?)
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Offline bonkers

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Re: Question about HMBC
« Reply #2 on: January 19, 2015, 07:45:17 AM »
Quote from: Irlanur on January 19, 2015, 06:37:32 AM
conditions? (eg solvent?)
40 mg in 0.6ml DMSO
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Offline Babcock_Hall

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Re: Question about HMBC
« Reply #3 on: January 19, 2015, 09:29:45 AM »
It is a forum rule that you must show your attempt at solving a problem before we can help.  What hydrogen atoms should or should not show up in the HMBC in theory?
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