Method for preparing cyclic phosphate or cyclic phosphite

[0025] Add 0.1 mol of phosphoric acid triester and 0.13 mol of neopentyl glycol into a four-necked flask equipped with a thermometer, an electric stirrer, and a reflux condenser, wherein the mass of 0.13 mol of neopentyl glycol is 13.52 g, and the temperature is raised to 140 ° C. Then add 0.068g of catalyst triethylamine, keep warm at 140-150°C for 9h; collect by-products, and distill off unreacted substances under reduced pressure after the reaction to obtain a light yellow liquid product with a yield of 81.3%.

[0026] The structural formula of the product obtained in the present embodiment is as follows:

[0027]

[0029] The 0.1 mol phosphotriester in Example 1 was replaced with 0.1 mol phosphite triester, and the others were the same as in Example 1, and the yield was 81.3%.

[0030] The structural formula of the product obtained in the present embodiment is as follows:

[0031]

[0033] Add 0.1moL of phosphoric acid triester and 0.10moL of ethylene glycol into a four-neck flask equipped with a thermometer, an electric stirrer, and a reflux condenser. Among them, the mass of 0.10moL of ethylene glycol is 6.21g, raise the temperature to 110°C, and then add Catalyst triethylamine 0.062g, heat preservation reaction at 110-130° C. for 5 hours, collect by-products, remove unreacted substances by vacuum distillation after the reaction, and obtain a light yellow liquid product with a yield of 81.3%.

[0034] The structural formula of the product obtained in the present embodiment is as follows:

[0035]