查看完整版本 : coupling constants for trans and cis alkenes

190303458 2015-4-9 03:45 PM

coupling constants for trans and cis alkenes

Why the coupling constants for trans-alkene protons (3JHH) are larger than that for its cis-protons? Please help! Thank you very much in advance!

jmlo 2015-4-15 10:26 PM

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It is due to the interaction of C-H bond orbitals in vicinal positions. This trend has been summarized as the Karplus curve (aka Karplus equation) proposed about 50 years ago based on experimental observations.
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查看完整版本: coupling constants for trans and cis alkenes