Compare the dipole moments of fulvene and 6,6-dimethylfulvene. Is the dipole moment of (a) greater than, less than or equal to that of (b) ?
(a) (b)

Question

Compare the dipole moments of fulvene and 6,6-dimethylfulvene. Is the dipole moment of (a) greater than, less than or equal to that of (b) ? (a) (b)

TestHub · Accepted Answer

Both are polarised toward a cyclopentadienide ring. The two C H 3 ​ groups of 6,6-dimethylfulvene stabilise the positive exocyclic carbon by +I and hyperconjugation, so the dipolar form contributes more. So a < b.

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