Sulfonated charcoal, a mild and efficient reagent for the preparation of cyclic acetals, dithioacetals and benzodioxepines
作者:Haris K. Patney
DOI:10.1016/s0040-4039(00)92642-x
日期:1991.1
1,3-Dioxolanes, 1,3-Ditholanes and 1,5-dihydro-3-2,4-benzodioxepines were prepared by the direct condensation of carbonyl compounds with 1,2-ethanediol, 1,2-ethanedithiol or 1,2-benzenedimethanol under the heterogeneous conditions of sulfonated charcoal catalyst.
Conformational Flexibility as a Tool for Enabling Site-Selective Functionalization of Unactivated <i>sp</i><sup><i>3</i></sup> C–O Bonds in Cyclic Acetals
作者:Ciro Romano、Laura Talavera、Enrique Gómez-Bengoa、Ruben Martin
DOI:10.1021/jacs.2c04513
日期:2022.7.6
A dual catalytic manifold that enables site-selective functionalization of unactivated sp3 C–O bonds in cyclic acetals with aryl and alkyl halides is reported. The reaction is triggered by an appropriate σ*–p orbital overlap prior to sp3 C–O cleavage, thus highlighting the importance of conformational flexibility in both reactivity and site selectivity. The protocol is characterized by its excellent
Montmorillonite KSF, a Mild and Efficient Catalyst for Benzodioxepination of Carbonyl Compounds
作者:Harish K. Patney
DOI:10.1080/00397919308011246
日期:1993.6
A mild and efficient procedure for the protection of carbonyl compounds as 1,5-dihydro-3H-2,4-benzodioxepines in high yields is described by using a readily available and inexpensive KSF clay catalyst.
Kumar T. Pavan, Reddy K. Ramesh, Reddy Ravinder S., J. Chem. Res. Synop, (1994) N 10, S 394-395
作者:Kumar T. Pavan, Reddy K. Ramesh, Reddy Ravinder S.
DOI:——
日期:——
Protection of Carbonyl Compounds as 1,5-Dihydro-2,4- Benzodioxepines Over HZSM-5 Zeolite, As A Reusable Catalyst
作者:M. Tajbakhsh、B. Mohajerani、M. M. Heravi
DOI:10.1080/00397919908085745
日期:1999.1.1
A mild and effecient catalytic method for acetalization of carbonyl compounds as 1,5-dihydro-2,4-benzodioxepines with benzene 1,2-dimethanol using acidic HZSM-5 zeolite as reusable catalyst is described.