synthesis of catalyst: PPO reacts with bromine at 130 ℃ with chlorobenzene as solvent for about 2 hours, and precipitates the product with ethanol. It was washed with ethanol extraction and dried. The product was identified by NMR and was mainly benzyl bromide of PPO (bromine content was 365%). The product refluxed with n-propylamine in ethanol solvent for 5 hours, washed and dried with ethanol, then dried to obtain PPO functional group compound, then refluxed with palladium chloride in ethanol for 10 hours, washed and dried, and reduced with hydrazine-30% aqueous solution to obtain PPO supported palladium catalyst.
PPO reacted with bromine at 50 ℃ with chloroform as solvent for 2h. The product was identified by NMR as mainly benzene ring bromide of PPO (bromine content 40%). After reacting with tetrahydrofuran solution of Ph2Pli for 2h under the protection of room temperature and nitrogen, the product was precipitated with ethanol, washed and dried. PPO containing diphenylphosphine group was obtained. Under the protection of nitrogen, PPO of diphenylphosphine group refluxed with palladium chloride in ethanol for 5h, washed and dried to obtain PPO supported palladium catalyst.