have been done for unstable molecules that showed them to have long bond lengths, and an analysis of the X-ray structure for the photoisomer of [2.2]-tetrabenzoparacyclophane (see Chapter 2) showed a CC bond length of 1.77 A ˚ .66,6566Long bond lengths have been observed in stable molecules such as benzocyclobutane derivatives.67 A bond length of 1.729 A ˚ was reliably measured in 1,1-di-tert-butyl-2, 2-diphenyl-3,8-dichlorocyclobutan[b]naphthalene, 3.68 X-ray analysis of several of these derivations confirmed the presence of long CC bonds, with 4 having a confirmed bond length of 1.734 A
have been done for unstable molecules that showed them to have long bond lengths, and an analysis of the X-ray structure for the photoisomer of [2.2]-tetrabenzoparacyclophane (see Chapter 2) showed a CC bond length of 1.77 A ˚ .66,6566Long bond lengths have been observed in stable molecules such as benzocyclobutane derivatives.67 A bond length of 1.729 A ˚ was reliably measured in 1,1-di-tert-butyl-2, 2-diphenyl-3,8-dichlorocyclobutan[b]naphthalene, 3.68 X-ray analysis of several of these derivations confirmed the presence of long CC bonds, with 4 having a confirmed bond length of 1.734 A
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