After this, the mixture was left to achieve ambient temperature,1ml of THF was added and then refluxed by 1 h.
After elapsed this time, 7.9 g of p-bromostyrene dissolved in 4.2 ml of THF was slowly added, and the system was maintained in reflux by 1 h more, until the formation of a black precipitate.
The suspension formed was agitated until achieve 25 ◦C and 2.0 g of C, dissolved in 14.3 ml of THF, were added.
The mixture obtained was agitated for 1 h, and then 10 ml of purifiedwater were added.
The monomer formed was extracted with three portions of 20 ml of ethyl ether, and the organic phase obtained
was washed with saturated solution of NaHSO3 and dried with anhydrous MgSO4. A concentration step was carried
out by evaporation of the solvent at low pressure, and the oil obtained was purified in a column loaded with silica gel containing 1% (w/v) of triethylamine employing the mixture hexane:ethyl ether as eluent.
Working at these conditions,2.85 g of E were obtained in a form of a pale yellow oil (yield of 76%)