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For questions about addition to C–C π bonds (i.e. C=C or C≡C).

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Why does the chlorination of indene occur with syn selectivity in heptane?

In the chlorination of indene to form 1,2-dichloro-2,3-dihydro-1​H-indene in heptane as solvent, the syn dichloride is formed as the major product, as reported in J. Org. Chem. 1980, 45 (25), 5150–515 …
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