Syn-5,21-di-tert-butyl-1,2-dimethyl[2.10]metacyclophan-1-ene syn-4 was prepared by the McMurry reaction of 1,10-bis(3-acetyl-5-tert-butyl-2-methoxyphenyl)decane 3, and nitrated with fuming nitric acid to give the two-fold ipso-nitration product syn-5 in good yield.
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