6‐ [l‐propenyl]‐fulvene (11), 6‐isopropenyl‐fulvene (111) and 6‐methyl‐vinyl‐ fulvene (IV) have been prepared by condensation of cyclopentadiene with trans‐ crotonaldehyde, methacrolein and methyl vinyl ketone, using sodium ethylate as base. The UV.‐, 1R.‐ and NMR.‐spectra have been investigated.
Fulvene (I) better than 98% pure has been prepared in 74% yield by reacting at 0° equimolar quantities of triethylamine and the mixture of the acetoxymethylcyclopentadienes IIa + IIb.
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