13848-66-3Relevant academic research and scientific papers
Studies of Phosphazenes. Part 21. Associative and Dissociative Pathways in the Aminolysis Reactions of Halogenocyclotriphosphazenes
Katti, Kattesh V.,Krishnamurthy, Setharampattu S.
, p. 285 - 290 (2007/10/02)
The rates of stepwise replacement of chlorine from hexachlorocyclotriphosphazene (N3P3Cl6) by -NMe2, the last chlorine atom from N3P3(OPh)5Cl by alkylamines, and the first fluorine atom from N3P3F6 by -NMe2, in methyl cyanide, have been determined at three temperatures.Detailed analysis of the kinetic data suggests a concerted SN2(P) mechanism for the first and second Cl substitutions.A sharp changeover from an SN2(P) to an SN1(P) mechanism occurs at the fourth substitution; the replacement of chlorine from N3P3(OPh)5Cl also occurs by an SN1(P) pathway.The first F substitution from N3P3F6 by -NMe2 proceeds ca. 20 times slower than the analogous reaction for N3P3Cl6; the kinetic data for these two reactions are in accord with a two-step SN2(P) pathway.Many diverse findings reported for the aminolysis reactions of halogenocyclophosphazenes are explained in terms of the continuous spectrum of mechanisms established in the present study.
