Relative Stabilities cumulated terminal diene alkyne twice 1-pentene 1.2-pentadiene I-pentyne internal alkyne 292 2-pentyne more substituted isolated 291J dlene 入 isolated 275kJ 1.4-pentadiene diene 入 trans-1.4-hexadiene conjugated 252k diene 242k」 trans-1,3-pentadicne 225kJ alkane (pentane or hexane) Copyright 2005 Pearson Prentice Hall,Inc. => Chaper 15 4Chaper 15 4 Relative Stabilities twice 1-pentene more substituted =>