10.11The two double bonds of 2-methyl-1,3-butadiene are not equivalent, and so two different productsof direct addition are possible, along with one conjugate addition product.10.12The molecular formula of the product, C10H9ClO2, is that of a 1:1 Diels–Alder adduct between2-chloro-1,3-butadiene and benzoquinone.10.13“Unravel”the Diels–Alder adduct as described in the sample solution to part (a).(b)(c)10.14Two stereoisomeric Diels–Alder adducts are possible from the reaction of 1,3-cyclopentadiene andmethyl acrylate. In one stereoisomer the CO2CH3group is syn to the bridge, and is calledthe endoisomer. In the other stereoisomer the CO2CH3group is anti to the bridge and iscalled the exoisomer.11,3-Cyclopentadiene1OOCH3CHEndo isomer (75%)OOCH
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