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Additions to the triple bond of 1 b–c; a) 2 M HCl in Et2O (1.5 equiv.), CH2Cl2, rt, 12 h; b) ICl (1.2 equiv.), CH2Cl2, rt, 12 h; c) Br2 1.0 (equiv.), CH2Cl2, rt, 12 h; d) cyclopentadiene (5.0 equiv.), CH3CN, 100 °C, μW, 2 h. X‐ray structures of 8 and 11; hydrogen atoms removed for clarity and ellipsoids shown at 50 % probability.[15]
