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10-Hydroxy-5-methyl-5, 10- dihydrophenophosphazine 10-oxide (1) was prepared by a new technique of treating 10-methoxy-5,10-dihydrophenophosphazine 10-oxide (2) with an equivalent of NaH in anhydrous DMF, and then at 120℃ for 3～4 h, which not only avoided