T. Mukaiyama et al., A novel carbocationic species paired with tetrakis(pentafluorophenyl)borate anion in catalytic Aldol reaction, CHEM LETT, (6), 2000, pp. 606-607
The aldol reaction of several aldehydes with silyl enol ethers proceeded sm
oothly to give the corresponding aldols in good to high yields at -78 degre
es C by using 1.0 mol% of a novel cationic species with tetrakis(pentafluor
ophenyl)borate anion.