title: Synthesis of a new class of fused cyclotetraphosphazene ring systems.
abstract: Octachlorocyclotetraphosphazene (1) was reacted with butylamines [n-butyl, i-butyl, sec-butyl, and t-butyl] in a 1:0.8 mol ratio in THF to obtain cyclotetraphosphazenes bearing a P-NH group, N4P4Cl7(NHR) [R = n-butyl (2a), i-butyl (2b), sec-butyl (2c), t-butyl (2d)](2a-d). The cyclotetraphosphazene derivatives 2a, 2b, and 2c were treated with sodium hydride giving rise to a new type of cyclophosphazene compounds (P8N8 ring) consisting of three fused tetramer rings (3a-c). Whereas reaction of sodium hydride with the t-butylaminocyclophosphazene derivative (2d) gave a P-O-P bridged compound (4) presumably as a result of hydrolysis reaction associated with moisture in the solvent. It is likely that the 16-membered cyclooctaphosphazene derivatives (3a-c) are formed by a proton abstraction/chloride ion elimination, intramolecular nucleophilic attack, ring opening and intermolecular condensation processes, respectively.
authors.affiliation: Department of Chemistry, Gebze Technical University , 41400 Gebze-Kocaeli, Turkey.
authors.forename: Serap
authors.initials: S
authors.lastname: Beşli
authors.forename: Ceylan
authors.initials: C
authors.lastname: Mutlu
authors.forename: Hanife
authors.initials: H
authors.lastname: İbişoğlu
authors.forename: Fatma
authors.initials: F
authors.lastname: Yuksel
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Allen
mesh_terms: D002082:Butylamines / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry; D018360:Crystallography, X-Ray; D005663:Furans / Q000737:chemistry; D010753:Phosphoranes / Q000138:chemical synthesis* / Q000737:chemistry; D011522:Protons; D017670:Sodium Compounds / Q000737:chemistry
chemical_list: D002082:Butylamines; D002712:Chlorides; D005663:Furans; D010753:Phosphoranes; D011522:Protons; D017670:Sodium Compounds; C524957:sodium hydride; C022606:octachlorocyclotetraphosphazene; C018674:tetrahydrofuran