Abstract
AbstractThe synthesis is described of narrow distribution polystyrenes initiated by the 2,7‐dimethyl‐3,6‐diphenyl‐octane dianion (DDO2−). DDO2− was synthesized via electron transfer from lithium or potassium metal to 3‐methyl‐2‐phenyl‐1‐butene (MPB) in tetrahydrofuran at temperatures between −78 and −100 °C. In contrast to the analogous α‐methyl styrene, there was no evidence of MPB polymerization. The structure of DDO2− was demonstrated by 1H and 13C NMR, as well as gas chromatography/mass spectrometry characterization of the DDO2− protonation and methylation products. In addition, kinetic studies were performed by ultraviolet–visible spectrophotometry for the determination of the stability of this anion in comparison with other similar species. The initiation of styrene by DDO2− led to narrow molecular weight polymers, as shown by size exclusion chromatography. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 2108–2115, 2002
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