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Topic: Why does increasing electron density near Boron cause a downfield shift?  (Read 2933 times)

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Offline SheffieldWednesday4ever

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Why does increasing electron density near Boron cause a downfield shift?
« on: October 16, 2011, 02:05:43 AM »
I know for C and H-NMR, that higher electron density near the nuclei means a more downfield shift (greater +ppm). But for 11B-NMR, the chemical shift of the signal in Me2B(ethane) is 86.8, and for Me2B(ethene), it's 56.4. Shouldn't the ethene species be higher considering there is higher electron density?
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