The material shown in the figure achieved solution‐processability, excellent transparency, a high glass transition temperature of 329 °C, an ultralow coefficient of thermal expansion of 7.3 ppm K−1 and toughness as obtained by solution casting.
Highly substituted phthalides were efficiently synthesized by sequential Cp(*)RuCl-catalyzed cyclotrimerization of alkynylboronates, propargyl alcohols, and terminal alkynes and palladium(II)-catalyzed carbonylation of the resultant arylboronates. The intermediate arylboronate was isolated and unambiguously characterized by X-ray crystallography. The perfect regioselectivity of the ruthenium-catalyzed formal intermolecular cyclotrimerization was discussed on the basis of the density functional calculations of a boraruthenacycle intermediate.
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