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Chapter 8 263
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resonance hybrid
the actual structure of a compound with delocalized electrons; it is represented by
two or more resonance contributors with localized electrons.
s
-cis-conformation
the conformation in which two double bonds of a conjugated diene are on the same
side of a connecting single bond.
separated charges
a positive and a negative charge that can be neutralized by the movement of
electrons.
s
-trans-conformation
the conformation in which two double bonds of a conjugated diene are on opposite
sides of a connecting single bond.
symmetric molecular orbital
an orbital with a plane of symmetry so that one half is the mirror image of the
other half.
thermodynamic control
when a reaction is under thermodynamic control, the relative amounts of the
products depend on their stabilities.
thermodynamic product
the most stable product.
withdrawal of electrons
withdrawal of electrons through
p
bonds.
by resonance