, and tris(2-dimethylaminoetheny1)-methinium perchlorate (6)-were studied by polarized hyper-Rayleigh scattering (HRS). The NLO activity of these two-dimensional NLO chromophores is attributed to three-level contributions to the
The highly strained Dewer‐benzene 1 and the prismane 2 can be obtained from Cyclooctyne in a few steps. 2 is formed by irradiation of 1 with long wavelength light; at λ = 250 nm only polymers are formed, presumably via the corresponding [5]paracyclophane.
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