The aminopropylated Silica-Gel hydrochloride (APSG.HCl) proved to be an efficient catalyst for the rapid conversion of carbonyl compounds in the corresponding acetals with high yields and in mild and selective conditions. In addition to the obvious advantages offered by heterogeneous catalysis, the present method results very useful when the presence of a weakly-acidic function chemically bonded on
2,3-Dichloro-5,6-dicyano-<i>p</i>-benzoquinone (DDQ) as a Highly Efficient and Mild Catalyst for Diethyl Acetalization of Carbonyl Compounds
作者:Babak Karimi、Ashraf Miri Ashtiani
DOI:10.1246/cl.1999.1199
日期:1999.11
Various types of structurally different carbonyl compounds in the presence of ethyl orthoformate (EtO)3CH could be efficiently converted to their diethyl acetals by using a catalytic amount (1-3 mol%) of DDQ under mild reaction conditions.
Zirconium Tetrachloride (ZrCl<sub>4</sub>) Catalyzed Highly Chemoselective and Efficient Acetalization of Carbonyl Compounds
作者:Habib Firouzabadi、Nasser Iranpoor、Babak Karimi
DOI:10.1055/s-1999-2605
日期:1999.3
Zirconium tetrachloride (ZrCl4) is a highly efficient and chemoselective catalyst for the acetalization, and in-situ transacetalization of carbonyl compounds under mild reaction conditions.
Highly efficient and chemoselective interchange of 1,3-oxathioacetals and dithioacetals to acetals promoted by N-halosuccinimide
作者:Babak Karimi、Hassan Seradj、Jafar Maleki
DOI:10.1016/s0040-4020(02)00389-7
日期:2002.5
Highly efficient interconversion of a range of 1,3-oxathiolanes, 1,3-dithiolanes and 1,3-dithianes to their acetals at ambient temperature using N-bromosuccinimide or N-chlorosuccinimide and different types of alcohols and diols was investigated.
Reduction of Acetals with TiCl<sub>4</sub>–LiAlH<sub>4</sub>
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 fromaliphaticaldehydes and ketones were treated with TiCl4–LiAlH4 in diethyl ether, the reductive dealkoxylation took place and the corresponding