Abstract
A theoretical study of the observed visible and ultra-violet spectra of C
18
H
18
, C
24
H
24
and C
30
H
30
indicates strongly that in these molecules the C—C bonds alternate in length. It is shown, furthermore, that the diamagnetic anisotropies and proton chemical shifts should indicate very sensitively the extent of bond alternation; as yet no measurements on these properties are available.
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