Metacyclophanes and related compounds. 4. Halogenations of 8,16-dialkyl-anti-5,13-di-tert-butyl[2.2]metacyclophan-1-enes and 2,7-di-tert-butyl-trans-10b,10c-dialkyl-10b,10c-dihydropyrenes
Metacyclophanes and related compounds. 4. Halogenations of 8,16-dialkyl-anti-5,13-di-tert-butyl[2.2]metacyclophan-1-enes and 2,7-di-tert-butyl-trans-10b,10c-dialkyl-10b,10c-dihydropyrenes