Crystal and molecular structure of the spiransa and dispiransa cyclophosphazenic derivatives from spermidine and spermine, N3P3Cl3[HN(CH2)3N(CH2)4NH] and N3P3Cl2[HN(CH2)3N(CH2)4N(CH2)3NH]

Retention of Configuration in the Nucleophilic Substitution Reactions of Some Nine‐Membered Ansa Derivatives of Cyclotriphosphazatriene

“…Cyclophosphazene derivative 5 [10] also has a nine-membered cis-ansa ring in which the two atoms linking the ansa bridge to the group are nitrogen rather than the oxygen atoms as in 1 and the macrocyclic cyclophosphazene derivatives.…”

“…This behaviour is in striking contrast to that observed for the macrocyclic derivatives with a sixteen-membered ring, which is sufficiently long to allow inversion of configuration. [6] The cyclophosphazene derivative 5 [10] has a nine-membered cis-ansa ring in which the two atoms linking the ansa bridge to the group are nitrogen rather than the oxygen atoms in 1 and the macrocyclic cyclophosphazene derivatives.…”

“…The effect is observed in two different molecular systems; nucleophilic substitution (Scheme 1) of the tetrafluorobutanedioxy derivative, N 3 P 3 Cl 4 (OCH 2 CF 2 CF 2 CH 2 O) (1), [9] which has a cis-ansa ring with nine atoms including those in the cyclophosphazene ring, and nucleophilic substitution (Scheme 2) of the tricyclic compound (5), [10] in which the two atoms linking the ninemembered cis-ansa ring in the ansa bridge to the cyclophosphazene group are nitrogen rather than the oxygen atoms as in (1) (and the macrocyclic-cyclophosphazene derivatives [6] ).…”

Chiral configurations in cyclophosphazene chemistry

“…Some crystallographic examples are given as meso and/or racemic forms for Type II(3) meso-cis (6 [36], 12a [46], 40a [87], 40b* [88], 40c [89], 41a* [90], 41b,c [ (3) rac-trans (5 [36], 9a [62], 11a,d [46], 51 [97], 52a,b [98], 53 [36], 54* [99]). It is not possible meso form for Type II(4), Type II(5), Type II(7) Type II (8) and Type II (9) configurations.…”

Formation of novel spiro, spiroansa and dispiroansa derivatives of cyclotetraphosphazene from the reactions of polyfunctional amines with octachlorocyclotetraphosphazatetraene

“…19,20 Although, a large number of octachlorocyclotetraphosphazatetraene (1), N 4 P 4 Cl 8 , with monofunctional amines were prepared and studied, 21-31 discussion on a substitution with polyfunctional amines is relatively limited in the literature. [32][33][34][35][36][37] We report here, the synthesis and structural characterization of six new cyclotetraphosphazene derivatives (scheme 1) and, to the best of our knowledge, there is no report so far of any derivative in this series that has been structurally characterized by any spectral data or x-ray crystallography.…”