Lanthanide Triflates as Water-Tolerant Lewis Acids. Activation of Commercial Formaldehyde Solution and Use in the Aldol Reaction of Silyl Enol Ethers with Aldehydes in Aqueous Media
Lanthanide trifluoromethanesulfonates (triflates), especially ytterbium triflate (Yb(OTf)3), were found to be stable Lewis acids in water.In the presence of a catalytic amount of lanthanide triflate, formaldehyde in water solution (commercial formaldehyde
Kobayashi, Shu,Hachiya, Iwao
p. 3590 - 3596
(2007/10/02)
The aldol reaction of silyl enol ethers with aldehydes in aqueous media
The aldol reaction of silyl enol ethers with aldehydes is successfully carried out in aqueous media by using a lanthanide trifluoromethanesulfonate as a catalyst. Water soluble aldehydes are applicable and the catalyst can be recovered and reused in this
Kobayashi,Hachiya
p. 1625 - 1628
(2007/10/02)
TRIMETHYLSILYL TRIFLATE CATALYZED ALDOL-TYPE REACTION OF ENOL SILYL ETHERS AND ACETALS OR RELATED COMPOUNDS
Trimethylsilyl triflate with or without added hindered tertiary amines catalyzes directed condensation of enol trimethylsilyl ethers with acetals, orthoformate, or 2-acetoxytetrahydrofuran or -pyrans to give the corresponding β-alkoxy carbonyl compounds.R
Murata, Shizuaki,Suzuki, Chikusa,Noyori, Ryoji
p. 4259 - 4276
(2007/10/02)
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