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January 04, 2011


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That kind of correlation, herein between the proton at 2.15 and the carbon at 84.7, i.-e. a 4J correlation, is rare. It can be observed because the signal at 2.15 account for 3H and is singlet. Also, the torsional angle could also explain this observation (W shape). But the signal at 5.31 looks like a doublet accounting for 1H. It's just normal that an HMBC correlation isn't observed.

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