Combination of NH2OH·HCl and NaIO4: an effective reagent for molecular iodine-free regioselective 1,2-difunctionalization of olefins and easy access of terminal acetals
A Novel, Efficient, and Selective Cleavage of Acetals Using Bismuth(III) Chloride
作者:Gowravaram Sabitha、R. Satheesh Babu、E. Veakata Reddy、J. S. Yadav
DOI:10.1246/cl.2000.1074
日期:2000.9
Treatment of acetals with bismuth(III) chloride in methanol provides a simple, convenient and chemoselective process for deprotection, and the parent aldehyde or ketone was obtained in high yield. The acetals have been cleaved selectively in the presence of silyl, benzyl and tetrahydropyranyl ethers.
Robust acidic pseudo-ionic liquid catalyst with self-separation ability for esterification and acetalization
作者:Yingxia Shi、Xuezheng Liang
DOI:10.1007/s11696-019-00693-1
日期:2019.6
The novel acidic pseudo-ionic liquidcatalyst with self-separation ability has been synthesized through the quaternization of triphenylphosphine and the acidification with silicotungstic acid. The pseudo-IL showed high activities for the esterification with average conversions over 90%. The pseudo-IL showed even higher activities for acetalization than traditional sulfuric acid. The homogeneous catalytic
A Simple, Efficient and General Procedure for Acetalization of Carbonyl Compounds and Deprotection of Acetals under the Catalysis of Indium(III) Chloride
作者:Brindaban C. Ranu、Ranjan Jana、Sampak Samanta
DOI:10.1002/adsc.200303154
日期:2004.3
Indium(III) chloride efficiently catalyzes the protection of a variety of aldehydes and ketones to their corresponding 1,3-dioxolanes and dialkyl acetals in refluxing cyclohexane. On the other hand, deprotection of acetals is also achieved in refluxing aqueous methanol under the catalysis of indium(III) chloride.
Anhydrous Iron(III) Chloride Dispersed on Silica Gel; III.<sup>1,2</sup>A Convenient and Mild Reagent for Deacetalization in Dry Medium
作者:Antoine Fadel、Ramdane Yefsah、Jacques Salaün
DOI:10.1055/s-1987-27833
日期:——
Acetals of various structures are conveniently cleaved under mild conditions by anhydrous iron(III) chloride dispersed silica gel in the absence of any solvent.
A New Ready, High-Yielding, General Procedure for Acetalization of Carbonyl Compounds
作者:Romualdo Caputo、Carla Ferreri、Giovanni Palumbo
DOI:10.1055/s-1987-27955
日期:——
Carbonyl compounds are smoothly and rapidly acetalized by treatment with alcohols, in anhydrous acetonitrile, in the presence of polystyryl diphenyl phosphine - iodine complex as catalyst. Open and cyclic acetals, including 1,3-dioxolanes, 1,3-oxathiolanes, and 1,3-dithiolanes, of miscellaneous aldehydes and ketones have been successfully prepared in this way. The isolation of the product is very easily performed, by simple filtration of the polymer-linked phosphine oxide which is formed in the reaction.