Question: When the compound having a Cyclobutene fused to a five-membered ring is heated, (IZ, 3Z)-1, 3-cvcloheptadicne is formed. When the related compound having a Cyclobutene

When the compound having a Cyclobutene fused to a five-membered ring is heated, (IZ, 3Z)-1, 3-cvcloheptadicne is formed. When the related compound having a Cyclobutene fused to an eight-membered ring is healed, however, (1E, 3Z)-1, 3-cyclodecadiene is formed. Explain these results, and suggest a reason why opening of the eight-membered ring occurs at a lowertemperature.

270 C 190 C

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