Synthesis and structures of unsymmetrical bis- and tris- cyclotriphosphazenes

Abstract

Synthesis and characterization of several unsymmetrical bis- and tris-spirocyclic cyclotriphosphazenes that include the ones with chiral 1,1 ′-bi-2-naphthol are reported. Specifically, the compounds N3P3(OCH2CMe2CH2O) (HNCH2CMe2CH2NH)Cl2 (1), N 3P3(OCH2CMe2CH2O) (HNCH2CMe2CH2NH)[(2,2′-OC 6H4)2] (2), N3P3(OCH 2CMe2CH2O)[(2-OC10H 6)2CH2]Cl2 (3), N3P 3(OCH2CMe2CH2O)[1,1 ′-O2(C10H6) 2]Cl2 (4), N3P3(OCH 2CMe2CH2O)(HNCH2CMe 2CH2NH) (1,1′-O2(C 10H6)2) (5) and N3P 3(OCH2CMe2CH2O)[1,1 ′-O2(C10H6)2] 2 (6) are prepared by starting with the mono-spiro compound N 3P3(OCH2CMe2CH2O)Cl 4. No ansa type of compound was isolated from these reactions. X-ray structures of 1 and 2 have been determined. Synthesis of the tris-spiro compound N3P3[1,1′-O2(C 10H6)2]3 (7), possessing the 1,1′-bi-2-naphthoxy residue is also reported. © 2004 Elsevier Ltd. All rights reserved.