Opposites attract. A novel concept for dual-activation catalysis takes advantage of the cooperative action of aprotic contact ion pair catalysis and Lewis acid catalysis. This strategy was used for the first trans-selective catalytic asymmetric [2+2] cyclocondensation of acyl halides with aliphatic aldehydes, furnishing trans-configured 3,4-disubstituted β-lactones with high stereoselectivity.
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Kull et al. (2008) studied this question.
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