1. Pharmaceuticals: Pd(PPh3)4 is widely used in the synthesis of pharmaceuticals, where precise control over the formation of carbon-carbon bonds is crucial. 2. Materials Science: It is also employed in the synthesis of organic materials, including polymers and organic semiconductors. 3. Natural Product Synthesis: Many natural products, which are complex organic molecules found in nature, are synthesized using Pd(PPh3)4-catalyzed reactions.