LAUSR

Abstract Fluorodioxy substituted mono-spiro ( 1a , b ), di-spiro ( 2a , b ) and mono-ansa ( 3a – c ) cyclotriphosphazene derivatives were reacted with n -butylamine to obtain fluorodioxy cyclotriphosphazenes bearing a P-NH group. Then, the fluorodioxy cyclotriphosphazene derivatives containing one NH moiety ( 4a , b ; 5a , 5b and 6a – c ) which can give a deprotonation reaction were treated with sodium hydride giving rise to new types of bis-cyclophosphazenes bridged with a four-membered cyclophosphazane ring in a spiro arrangement ( 7 , 8 , 9a , b and 10a – c ). The deprotonation reactions of substituted cyclotriphosphazenes were investigated for the first time and rigid and stable spiro- and ansa-derivatives of N,N -spiro bridged biscyclotriphosphazenes were obtained. Additionally, the thermal stabilities of all new compounds were investigated and found that the thermal stability increases with the formation of N,N -spiro bridge.