Abstract
The living carbocationic polymerization of isobutylene initiated by tri-cumyl-ether (1)/BCl3 and tricumyl-acetate(2)/BCl3 was investigated by B11 NMR spectroscopy in the presence and absence of DMSO. With BCl3, 1 yields tri-cumyl-chloride and BCl2OMe due to fast exchange reaction, while 2 forms complexes. If the 1/BCl3 mixture contains DMSO, well defined complexes can be detected, i.e., DMSO.BCl3 and BCl2OMe.DMSO. In the system 2/BCl3/DMSO neutral complexes with broad NMR signals are formed. In the presence of isobutylene (real polymerization mixture) the same complexes can be detected.
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