Boron compounds such as 9-chloro-9-borabicyclo[3.3.1]nonane (B–Cl–9–BBN) and sterically hindered amine bases such as diisopropylethylamine (i-PrEtN) almost quantitatively give Z-boron enolates, which in turn lead to the syn-Aldol as main product.
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== {{int:filedesc}} == {{Information | Description = Stereoselective ''Z''-enolate formation of esters and its application in diastereoselective aldol addition reactions as reported in [https://doi.org/10.1021/ja00191a058 ''J. Am. Chem. Soc.'' (1989) '''111''', 3441–3442] Boron compounds such as 9-chloro-9-borabicyclo[3.3.1]nonane (''B''–Cl–9–BBN) and sterically hindered amine bases such as diisopropylethylamine (''i''-Pr...
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