Example 024

[π6s + π4s] Cycloaddition of tropone to cyclopentadiene

[6 + 4] Cycloaddition of tropone to cyclopentadiene
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Two groups discovered this reaction at the same time:

S. Ito, Y. Fujise, T. Okuda and Y. Inoue, Bull. Chem. Soc. Jpn., 1966, 39, 1351
DOI: 10.1246/bcsj.39.1351

R. C. Cookson, B. V. Drake, J. Hudec and A. Morrison, Chem. Commun., 1966, 15–16
DOI: 10.1039/C19660000015