Formation of Chelated Counteranions Using Lewis Acidic Diboranes: Relevance to Isobutene Polymerization
作者:Jianfang Chai、Stewart P. Lewis、Scott Collins、Timo J. J. Sciarone、Lee D. Henderson、Preston A. Chase、Geoffrey J. Irvine、Warren E. Piers、Mark R. J. Elsegood、William Clegg
DOI:10.1021/om700672q
日期:2007.11.1
The reactions of chelating diboranes with PhCMe2Cl and related initiators were studied by variable-temperature NMR spectroscopy. Although thermally stable ion-pairs featuring weakly coodinating anions (WCA) are formed, isobutene polymerization is complicated by the tendency of these WCA to act as hindered bases toward Bronsted acidic chain ends.