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Topic: Can someone help explain these coupling constants to me?  (Read 4157 times)

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Offline Ian

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Can someone help explain these coupling constants to me?
« on: April 17, 2007, 11:15:00 PM »
http://img266.imageshack.us/img266/3509/couplingif5.jpg

The Chemical shift is 5 something... so I'm guessing its one of the H on the alkene.  the 8J constant seems to be a cis coupling, but I do not know the other 2 constants (where they are coming from) and what d or t means?  =(
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Offline liuyuhong_0418

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Re: Can someone help explain these coupling constants to me?
« Reply #1 on: April 17, 2007, 11:30:48 PM »
double or triple
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Offline Ian

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Re: Can someone help explain these coupling constants to me?
« Reply #2 on: April 17, 2007, 11:32:09 PM »
What does that mean in this context?   ???
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Offline Custos

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Re: Can someone help explain these coupling constants to me?
« Reply #3 on: April 18, 2007, 12:43:23 AM »
You're on the right track. The proton in question will couple with the cis proton, the geminal proton (the one on the same carbon - because they are in different magnetic environments) and the third coupling (triplet) comes from long range coupling called allylic coupling - look it up.
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