NEW NONGEMINAL CYCLOPHOSPHAZENES |
| |
| Authors: | Patty Wisian-Neilson June-Ho Jung Srinagesh K Potluri Clayton E Mauldin Hongming Zhang |
| |
| Institution: | Southern Methodist University, Dallas , Texas, USA |
| |
| Abstract: | A series of new nongeminally-substituted cyclic phosphazenes with various substituents has been prepared via deprotonation-substitution reactions at the Me groups of both the cis and trans isomers of (Me)(Ph)PN] 3 . Treatment of (Me)(Ph)PN] 3 with n-BuLi followed by reaction with organic electrophilic reagents affords a variety of cyclic derivatives, (RCH 2 )(Ph)PN] 3 , R = Me, Cl, Br, I, (CH 2 ) 2 Br, CH 2 CH═CH 2 , SR, C(═O)OLi, C(═O)OMe, C(═O)OEt]. The structures of theses cis cyclic phosphazenes, which were obtained by x-ray diffraction, illustrate the basket-like shape of the molecules. Heating the cis and trans isomers of the parent (Me)(Ph)PN] 3 produced mixtures of cyclic trimers and tetramers. The latter were isolated and characterized by x-ray crystallography. Nanoparticles of gold and silver were prepared by reduction of metal salts with a reducing agent in the presence of selected trimers. |
| |
| Keywords: | Nanoparticles nongeminal P─C substituents phosphazene tetramer trimer |
|
|
