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Unformatted text preview: which is more electronegative than the sp 3 carbon in ethane. Examples of !-Electron Anisotropic Effects 2-bromopropene C=C H H CH 3 Br diasteriotopic H ! 4-5 ! 2.27 as two resonances The CH 3 group is deshielded by the !-electrons and the electronegative Br ( "-effect). The resonances of the two vinyl H are more downfield because of the additional factor of bonding to an sp 2 carbon. C=C + + _ _ _ _ _ _ anisotropy of b generated by the !-electrons...
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