Stereoregular polymerization of polysiobutylene macromonomer having methacryloyl function

Summary The polysiobutylene (PIB) macromonomer having methacryloyl function was prepared from a hydroxy-terminated PIB, -phenyl--(2-hydroxy-1-methylethyl)-poly(1,1-dimethylethylene) and methacryloyl chloride in the presence of triethylamine. The macromonomer was polymerized by various anionic initiators to form stereoregular polymacromonomers. The polymerization of the macromonomer with t-C₄H₉MgBr and n-C₄H₉Li in toluene gave isotactic polymacromonomers. On the other hand, syndiotactic-rich polymacromonomers were obtained in the polymerizations with 1,1-diphenylhexyllithium in tetrahydrofuran and with t-C₄H₉Li/(C₂H₅)₃Al in toluene.