O, O ligand chelating resin

Such resins include a series of oxygen-containing groups such as hydroxycarboxylic acids, β-diketones, and phenols

Salicylic acid resin, there are two synthesis methods, one is through polymer reaction, the acid group to a macromolecular carrier, such as salicylic acid and from crosslinked chloromethylstyrene, catalyst ZnCI2 ₂ Under the action, the Fourier reaction is carried out to obtain salicylic acid resin

For example, take an appropriate amount of urushiol petroleum ether solution, weigh an appropriate proportion of S catalyst, grind it and add it to the reaction flask, stir at a constant temperature of 20°C for reaction, after prepolymerization for 1 hour, add salicylic acid and grafting catalyst, and the temperature rises to Continue to stir and react at 50°C for 2h, add polymerization inhibitor to deactivate the catalyst, distill off the solvent, wash repeatedly with water, and dry at 40°C

β-Diketone resins are typical O, O ligand chelating resins, and there are roughly two synthetic methods

The other is to synthesize β-diketones by polymer reaction

β-ketoesters have a similar structure to βdiketones, and their complexing properties are also similar

Add 15g of macroporous polystyrene (PS) beads fully swollen by dimethylformamide into a mixture of 30mL concentrated HNO ₃ and 58mL concentrated H ₂ SO ₄ at 0～5℃ within 30 minutes, and then within 30 minutes The temperature was raised to 58°C and reacted for 30 minutes

Phenolic chelating resin can be prepared by diazonium salt coupling reaction, the reaction process is:

The o-hydroxyacetophenone chelating resin can be prepared by the following reaction: