2 u2014 o u2014 coo u2014 of hema 4 3 u03b4 2h u2014 o u2014 ch 2 u2014 c h 2 u2014 o u2014 coo u2014 of hema 5 5 u03b4 singlet 1h u2014 c u2550 c u2014 h a of hema 6 2 u03b4 singlet 1h u2014 c u2550 c u2014 h b of hema synthesis of oligo hbma co trolox hema cooh in a three necked round bottom flask equipped with a reflux condenser hbma 0 88 g 2 75 mmol trolox hema 0 90 g 2 75 mmol and 4 4 u2032 azobis cyanovaleric acid 0 077 g 0 275 mmol were dissolved in 30 ml dmf nitrogen gas was purged through the dmf solution for 30 minutes at room temperature polymerization was conducted at 80 u00b0 c for 12 hrs under the continuous purging of nitrogen oligo hbma co trolox hema cooh was isolated by precipitation of the dmf solution into 1 l distilled water ph 1 5 the product was purified by first extraction in acetone and then reprecipitation from dichloromethane into n hexane yield 1 g 56 1 h nmr cdcl 3 0 8 u03b4 singlet u2014 c h 2 u2014 c u2014 ch 3 of polymer backbone 1 5 1 7 u03b4.