Termination and side-reactions of polystyryllithium with beta-bromostyrene.
Low molecular weight polystyryllithium was synthesised and terminated with a two-fold molar excess of beta-bromostyrene to produce an end-functionalised polymer. 1,3-Diphenylallyl-terminated polystyrene and other reaction products were analysed by FT-Raman spectroscopy. By comparison with model compounds, it can be deduced that beta-bromostyrene with a predominantly trans configuration gave rise to primarily cis conformational unsaturation at the polystyrene chain-end. It was also demonstrated that a polystyrene 'dimer' and 1,4-diphenylbutadiene were produced via side-reactions which are considered to result from metal-halogen exchange in the reagents.
Ward
Norman J
NJ
Chemical and Forensic Sciences, Interdisciplinary Research Centre for Polymer Science and Technology, University of Bradford, Bradford, West Yorkshire BD7 IDP, UK.
Edwards
Howell G M
HG
D007700:Kinetics; D008094:Lithium; D011137:Polystyrenes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013343:Styrenes / Q000737:chemistry*
D011137:Polystyrenes; D013343:Styrenes; C469723:polystyryllithium; C018238:beta-bromostyrene; D008094:Lithium