mmol were added and reacted for 2 hours at room temperature and for another 48 hours at 50 u00b0 c the reaction mixture was filtered to remove the precipitates et 3 n hcl or nacl the filtrate was concentrated at reduced pressure until only a small amount of the solvent remained to the filtrate excess amount of hexane was added to induce precipitation after repeating 2 3 times the procedure of dissolving the obtained precipitates in a small amount of acetone and precipitating by adding hexane the precipitate was dissolved in 25 ml of ethylacetate and extracted with distilled water 2 3 times to remove the remaining salts and the dried in a vacuum drier to remove other trace isomers the viscous liquid obtained above was dissolved in water 70 ml and cf 3 ch 2 oh 13 g an agent to lower the lcst was added to the mixture to induce precipitation after centrifuging the mixture the supernatant water was decanted after repeating the above procedure 3 times the product was vacuum dried to obtain 3 43 g yield 74 7 of the final triphosphazene product molecular formula c 27 h 57 n 6 o 15 p 3 elemental analysis c 40 00 h 7 21 n 10 20 p 11 60 theoretical value c 40 60 h 7 19 n 10 52 p 11 63 1 h nmr spectrum d 2 o ppm u03b4 1 2 1 4 b 3h u2014 nhch 2 cooch 2 c h 3 u03b4 3 4 s 3h u2014 o ch 2 ch 2 o 2 c h 3 u03b4 3 6 3 9 b.