The [(P+B-P+)CuCl3-](2) complex (P+B-P+ = phosphonium-borate-phosphonium) featuring the dication-monoanion-type counterion was synthesized. The resulting cationic copper catalyst enhanced the Mukaiyama-Aldol reaction of ketene silyl acetals and ketones for the formation of protected tertiary alcohols. (C) 2022 Elsevier Ltd. All rights reserved.
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