Phenylethynyl substituted benzenes 1, 2 and 3 are synthesized by the Pd-coupling reaction of phenylacetylene with the corresponding bromobenzene; the third-order optical non-linearity [χ(3)(ω)] increases with the participation of π-conjugation through the triple bond as determined by the degenerate four-wave mixing (DFWM) method in a chloroform solution.
K. Kondo, S. Yasuda, T. Sakaguchi and M. Miya, J. Chem. Soc., Chem. Commun., 1995, 55 DOI: 10.1039/C39950000055
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