abstract |
A preparation method of DOPO derivatives, related to flame retardants in the field of chemical materials, compound A and compound B in the presence of catalysts, entrainers, solvents, dehydration reaction at 1-6 atmospheres, 150-220 ° C 4 -30h produces compound I, its molecular formula is , the product prepared by this method is easy to purify, and has high yield and low cost. |