Monospiroaryloxyphosphazenes: p-Fluorophenoxy Derivatives Containing the 1,2-Phenylenedioxy and 2,3-Naphthalenedioxy Groups

The reactions of p-FC₆H₄OSiMe₃ with N₃P₃F₄X [where X is either 1,2-O₂C₆H₄ or 2,3-O₂C₁₀H₆] provide a convenient route to fully substituted phosphazenes, N₃P₃(p-FC₆H₄O)₄X. The X-ray structures of the monospiro phosphazene derivatives of 1,2-benzenediol [4,4,6,6-tetrakis(4-fluorophenoxy)-2,2-(1,2-phenylenedioxy)-1,3,5,2,4,6- cyclophosphazene, (1), C₃₀H₂₀F₄N₃O₆P₃] and 2,3-naphthalenediol [4,4,6,6-tetrakis(4-fluorophenoxy)-2,2-(1,2-naphthalenedioxy)-1,3,5,2,4,6- cyclophosphazene, (2), C₃₄H₂₂F₄N₃O₆P₃] contain an almost planar N₃P₃ core which lies perpendicular to the planar five-membered spiro group. The F atoms of the phenoxy groups are involved in the formation of weak intermolecular hydrogen bonds giving rise to dimeric networks in (1) and three-dimensional networks in (2).

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