Synthesis and solid-state polymerization of 5-(2-methylthio-4-methylpyrimidin-5-yl)penta-2,4-diyn-1-ol and of several of its derivatives

5-(2-Methylthio-4-methylpyrimidin-5-yl)penta-2,4-diyn-1-ol was synthesized by asymmetric coupling, and the corresponding diacetylene monomers were als o prepared in good yields. These monomers could be dissolved in common orga nic solvents. The monomers can be polymerized in the solid state using heat , light or gamma-radiation. In addition, micro- and macroscopic third-order susceptibilities were measured by the degenerate four-wave mixing (DFWM) m ethod for the yielded polymers.