Synonym: 5-(Phenylethynyl)isobenzofuran-1,3-dione
Melting point:152 °C
Purity: 98.00%
Uses: High-performance material
Appearance:Light yellow to light yellow-green crystal or powder
Description About 4-Phenylethynylphthalic anhydride(4-PEPA) CAS 119389-05-8:
4-phenylethynylphthalic anhydride (4-PEPA) was synthesized by the palladium/copper catalyzed Sonogashira coupling reaction between phenylacetylene and 4-bromophthalic anhydride. 
4-Phenylethynylphthalic anhydride(4-PEPA) as the end-capping reagent, and trifluoroacetic anhydride as the dehydrating agent; then high performance thermosetting polyimides and composites were produced from these oligomers via the thermal crosslinking reaction of the phenylethylnyl group and the material properties were fully investigated.