Reduce, reuse, recycle: Zwitterionic adducts of pyridyl-containing hexacoordinate phosphorus anions and (C5H5)Ru moieties (see picture) are air-, moisture-, and microwave-stable catalysts that can be readily purified and in some instances recycled. Carroll rearrangements of allylic β-ketoesters performed with these species occur with improved regio- and enantioselectivity.
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Constant et al. (2007) studied this question.
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