[6](1,4)Naphthalenophane (1a), [6](1,4)anthracenophane (2a), and their peri-substituted derivatives 1b, 1c, and 2b were synthesized from 8-bromo[6]paracyclophane (4) by a benzoannelation method. The 1H NMR spectral properties of 1b, 1c, and 2b as well as the X-ray crystallographic structure analysis of 1b indicate that their bridged aromatic rings are more distorted than those of the corresponding
The first total syntheses and structural studies of [6] (1,4) naphthalenophane (4) and [6] (1,4) anthracenophane (5), the smallest-bridged isolable cyclophanes with bentacene nuclei, are disclosed. The acenophanes 4 and 5 were successfully synthesized by the oxidative decarboxylation of benzo- and naphtho-fused propellenecarboxylic acids: the bridgehead olefins followed by subsequent treatment with
The unusual reactivity of [6](1,4)naphthalenophane (2) and [6](1,4)anthracenophane (3), the smallest-bridged acenophanes hitherto known, in electrophilic reactions has been disclosed. These reactions include (i) acid-catalyzed telomerization, (ii) peracid oxidation, and (iii) addition with dienophiles. Semi-empirical molecular orbital calculations (MNDO and MNDO/PM3) were performed in order to compare
[6](1,4)Naphthalenophane (1) and [6](1,4)anthracenophane (2) underwent thermal cycloaddition with tetracyanoethylene to give the corresponding [2+2] adducts 3 and 4. Anthracenophane 2 reacted with dimethyl acetylenedicarboxylate to yield the 1:1 and 1:2 adducts 6 and 7.
Telomers of bent arenes. Acid-catalyzed dimerization and trimerization of the 1,4-hexamethylene-bridged arenes [6]paracyclophane, [6](1,4)naphthalenophane, and [6](1,4)anthracenophane
Whereas treatment of 1,4-hexamethylene-bridged benzene [6]paracyclophane (1) with a catalytic amount of H2SO4 gave, as a minor product, dimer 6, along with isomers 4 and 5, similar treatment of 1,4-hexamethylene-bridged naphthalene [6](1,4)naphthalenophane (2) afforded predominantly dimers 7 and 8, together with trimers 9 and 10. The 1,4-hexamethylene-bridged anthracene [6](1,4)thracenophane (3) yielded only trimers 13 and 14.