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Keywords = heptafulvene

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Short Note
Methyl 3-(Propan-2-ylidene)-3a,9a-dihydro-3H-cyclopenta[a]azulene-9-carboxylate
by Miku Yoshida, Masafumi Yasunami, Ryuta Sekiguchi, Shunji Ito and Taku Shoji
Molbank 2026, 2026(4), M2199; https://doi.org/10.3390/M2199 - 3 Jul 2026
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Abstract
Methyl 3-(propan-2-ylidene)-3a,9a-dihydro-3H-cyclopenta[a]azulene-9-carboxylate (2) was synthesized in moderate yield via an [8 + 2] cycloaddition of methyl 2-oxo-2H-cyclohepta[b]furan-3-carboxylate (1) with 6,6-dimethylfulvene. The resulting compound was characterized by 1H and 13C NMR spectroscopy, high-resolution mass spectrometry, and single-crystal X-ray diffraction analysis. Full article
(This article belongs to the Section Structure Determination)
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