Abstract 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.
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Neuenschwander et al. (1964) studied this question.
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