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Solutions_Manual_for_Organic_Chemistry_6th_Ed 158

Solutions_Manual_for_Organic_Chemistry_6th_Ed 158 - 7-3 5 ~...

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7-35 ~ ~ ;=\' (a) trans, trans cis,trans trans,cis cis,cis (b) 2£,4£ 2Z,4£ 2£,4Z 2Z,4Z This problem is intended to show the difficulty of using cis-trans nomenclature with any but the simplest alkenes. Cis and trans are ambiguous: the first alkene in part (a) is cis if the two similar substituents are considered, but trans if the chain is considered. The £-Z nomenclature is unambiguous and is preferred for all four of these isomers. 7-36 (a) and (d) have no geometric isomers (b) (c) trans-pent-2-ene (E)-pent-2-ene cis-pent-2-ene (Z)-pent -2-ene trans-hex -3-ene (E)-hex -3-ene
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