作者:Hiroshi Ishikawa、Teruaki Mukaiyama
DOI:10.1246/bcsj.51.2059
日期:1978.7
The reduction of dialkyl acetals derived from aromatic aldehydes and ketones with TiCl4–LiAlH4 in THF or diethyl ether at room temperature afforded the coupling products, pinacol ethers or olefins, in high yields. On the other hand, when acetals derived from aliphatic aldehydes and ketones were treated with TiCl4–LiAlH4 in diethyl ether, the reductive dealkoxylation took place and the corresponding
在室温下,在四氢呋喃或乙醚中用 TiCl4–LiAlH4 还原芳香醛和酮衍生的二烷基缩醛,以高产率得到偶合产物频哪醇醚或烯烃。另一方面,当衍生自脂肪醛和酮的缩醛在二乙醚中用 TiCl4-LiAlH4 处理时,发生还原性脱烷氧基化,并以良好的收率分离出相应的醚。至于反应机理,我们提出 Ti(II) 是芳香醛和酮衍生的缩醛还原偶联反应中的反应物种,而 Ti(0)-H2AlCl 络合物可能是衍生自 frcm 的缩醛还原脱烷氧基的反应物种。脂肪醛和酮。