The reactions of 2-<i>trans</i>-6-bis(4-fluorobenzyl)spirocyclotetraphosphazene with primary amines: spectroscopic and crystallographic characterizations

Abstract

<p></p> <p>The substitution reactions of 2-<i>trans</i>-6-bis(4-fluorobenzyl)spirocyclotetraphosphazene (3; with a yield of 59%) are carried out with excess alkylamines, benzylamine, <i>n-</i>hexylamine, <i>n-</i>butylamine, <i>n-</i>propylamine and <i>iso-</i>propylamine in THF. As a result of these reactions, the fully substituted tetrabenzylamino (3a), tetrahexylamino (3b), tetrabutylamino (3c), tetrapropylamino (3d), and tetra<i>iso</i>propylamino (3e) 2-<i>trans</i>-6-bis-(4-fluorobenzyl)spirocyclotetraphosphazenes are obtained in high yields. The structural characterizations of the isolated compounds (3a-3e) were confirmed by elemental analyses, mass spectrometry (ESI-MS), Fourier transform infrared (FTIR), heteronuclear single quantum coherence (HSQC), heteronuclear multiple-bond correlation (HMBC) and ¹H, ¹³C{¹H}, ³¹P{¹H} NMR techniques. The solid state and molecular structures of 3a were determined using X-ray crystallography. Two independent molecules were present in its unit cell.</p