Synthesis of transannular- and spiro-substituted cyclotriphosphazenes: x-ray crystal structures of 1,1-[N3P3(OCH2CF3)4{O2C12H8}], 1,3-[N3P3(OCH2CF3)4{O2C12H8}], 1,1-[N3P3(OCH2CF3)4{O2C10H6}], and 1,3-[N3P3(OCH2CF3)4}O2C10H6}]

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