Long-Range Proton-Carbon Coupling Constants: NMR methods and applications
Long-Range Proton-Carbon Coupling Constants: NMR methods and applications
Publication date: Available online 20 July 2013
Source:Progress in Nuclear Magnetic Resonance Spectroscopy</br>
Author(s): Teodor Parella , Juan Félix Espinosa</br>
A general review of novel NMR methods to measure heteronuclear long-range proton-carbon coupling constants ( n J CH ; n>1) in small molecules is made. NMR experiments are classified in terms of NMR pulse scheme and cross-peak nature. A discussion about simplicity, general applicability and accuracy for each...
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07-20-2013 11:27 AM
[Question from NMRWiki Q&A forum] Gradient strength recalculation
Gradient strength recalculation
Iam bit stuck with % z gradient calculation used in Bruker pulse programs. In some instruments (Varian) they use as short as 200us for some gradient pulses, but in Bruker, they fix the length of all the gradient pulses as constant (say 500 us) and vary the gradient strength accordingly.
Hence, is there any easy way to convert a gradient pulse of say 17 G/cm applied for 0.5 ms to 'x' G/cm for 1ms.(where 'x' is the new gradient strength for 1ms).
Once this conversion is completed,the next step would be to calculate the gradient % which i think is the...
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06-12-2012 11:25 PM
[Question from NMRWiki Q&A forum] Downfield carbon paired with a upfield proton
Downfield carbon paired with a upfield proton
Dear sirsI have a natural product whose two carbon resoances are appearinga t 46 and 56 ppm but theirs proton resoanances are appearinga at 0.80 and 0.83 ppm respectively. I am unable to understand how there could be a downfield carbon (oxygenated carbon) is paird up with a upfield proton. I request your expert answer.Thanks in advance.
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05-20-2011 09:17 PM
[Question from NMRWiki Q&A forum] How can I calculate a carbon-proton coupling constant for a molecule?
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I'm trying to explain a missing HMBC peak, and having a coupling constant less than 10 Hz would do that nicely. It's a formamidine derivative with a 3 bond correlation N=CHNC The C is a quaternary carbon in a benzene ring. Any help would be appreciated.
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