Retroaldol regains control: A countercation may exert an important effect in promoting thermodynamic control in the TBAF-mediated aldol reaction of propargyl or allenyl esters (or a mixture of both) to produce, under mild conditions, carbinol allenoates exclusively (see scheme; TBAF=tetra-n-butylammonium fluoride).
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Xu et al. (2007) studied this question.
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