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Ihe title compwnd (1) was treated with NaEIatmtempereture inanbydrous DMF to give a sodium salt (containing nitrogen anion) which could shift the methyl grlnlp from oxygen to nitrogen atom to form N-methyl phosphinic add IS tbe reaction temperature gatioa on the above reaction InedlMh which would be porsibly re-w a~ i n & to UO T. lhree nitro derivative^ containing 5,lO-dihydmphmphmphazine ring system were prepared for the inwstigarded IS a spedal inter-mdecular substitrdioa, *. , the nude-Ophiuenilrqp anion from one molecule d 1 a t t a d d the carbon atom of the 0-methyl of andher 1. In addition, the & e m i d shuctures of seven compolmds cootaining 5 , l c r d i h~ ptuizine ring system involved in the experhnt were contlrmed by IR, ' A m , "PNMRandmmspectroscopy.

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