Precipitation–the solution? The recovery of a chiral copper(II) bis(oxazoline) catalyst by charge-transfer complexation and subsequent precipitation allows its efficient reuse in ene and cyclopropanation reactions for up to ten successive catalytic cycles and affords the desired products in high yields and enantioselectivities. The same catalyst batch is also successfully reused in three different asymmetric transformations in an original multireaction procedure.
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