Orientation in the Crossed Aldol Condensation of Chloral with Unsymmetrical Aliphatic Ketones
作者:Eberhard Kiehlmann、Pui-Wah Loo
DOI:10.1139/v71-260
日期:1971.5.15
in the crossed aldol condensation with chloral has been studied in glacial acetic acid and in dimethoxyethane. The reaction is irreversible and not accompanied by dehydration of the resulting 1,1,1-trichloro-3-hydroxy-4-alkanones. Except for butanone, condensation occurs preferentially at the least-hindered position of an unsymmetrical ketone. The α-methyl/α-methylene condensation product ratio obtained
New Cross Aldol Reactions. Titanium Tetrachloride-promoted Reactions of Silyl Enol Ethers with Carbonyl Compounds Containing A Functional Group
作者:Kazuo Banno
DOI:10.1246/bcsj.49.2284
日期:1976.8
It was found that, in the presence of titanium tetrachloride, silylenolethersselectively react with aldehyde or ketone function of various carbonyl compounds containing another functional group giving the corresponding cross aldols in good yields. The present cross aldol reaction was successfully applied to the synthesis of arturmerone, one of the volatile principles of turmeric oil.