| abstract |
The present invention relates to a kind of solid phosphazene compound, which has the structure shown in formula (1): Wherein, R a is a cross-linking agent, and R b is -N=PR 3 or R 1 , R 2 , R 3 and R 4 are each independently, selected from H, C 1-6 alkyl, C 1-6 cycloalkyl, C 1-6 heterocycloalkyl, optionally substituted aryl, any Optionally substituted benzyl. The compound has multiple guanidine functional groups and can be used as a catalyst, which can greatly reduce the separation and purification process of the catalyst from the product. It can be recovered only by simple filtration, and can be recycled after recovery. The catalytic activity changed little after that. |