When 1,3,5-cyclooctatriene, A, is heated to 80–100°C, it comes to equilibrium with an isomeric compound B. Treatment of the mixture of A and B with CH₃O₂C—C≡C—CO₂CH₃ gives a compound C, which, when heated to 200°C for 20 minutes, gives dimethyl phthalate and cyclobutene. Identify compounds B and C, and explain what reactions have occurred.

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CO₂CH3 CO₂CH3 dimethyl phthalate