Introduction of PEG-SANM nanocomposite as a new and highly efficient reagent for the promotion of the silylation of alcohols and phenols and deprotection of the silyl ethers
was prepared by a simple method and characterized using XRD, TGA, SEM, TEM, and FT-IR techniques. After preparation and characterization, this reagent was used as a highlyefficient and reusable solid acid catalyst for the chemoselective silylation of alcohols and phenols and deprotection of the obtained silyl ethers. The method offers several advantages including high to excellent yields of the products
Lakouraj; Akbari, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2003, vol. 42, # 5, p. 1165 - 1167
作者:Lakouraj、Akbari
DOI:——
日期:——
Tetrabutylammonium phthalimide-N-oxyl: An efficient organocatalyst for trimethylsilylation of alcohols and phenols with hexamethyldisilazane
作者:M. G. Dekamin、N. Yazdaninia、J. Mokhtari、M. R. Naimi-Jamal
DOI:10.1007/bf03249088
日期:2011.6
Tetrabutylammonium phthalimide-N-oxyl (TBAPINO) was found to be an effective organocatalyst for rapid, simple and chemoselective protection of the hydroxyl group of alcohols and phenols using hexamethyldisilazane (HMDS) under mild conditions. The low catalyst loading, high to quantitative yields and simple removal of the catalyst from the reaction mixture illustrate the other attractive features of this protocol.
Preparation, characterization and use of 3-methyl-1-sulfonic acid imidazolium hydrogen sulfate as an eco-benign, efficient and reusable ionic liquid catalyst for the chemoselective trimethylsilyl protection of hydroxyl groups
作者:Nader Ghaffari Khaligh
DOI:10.1016/j.molcata.2011.08.021
日期:2011.10
New and novel ionic liquid (3-methyl-1-sulfonic acid imidazolium hydrogen sulfate) is a recyclable and eco-benign catalyst for the chemoselective trimethylsilyl protection of hydroxyl groups under solvent-free conditions to afford trimethylsilanes in excellent yields (92-100%) and in very short reaction times (1-8 min). The catalyst was characterized by FT-IR, H-1 NMR and C-13 NMR studies. All the products were extensively characterized by H-1 NMR, IR, GC-MS and melting point analyses. A mechanism for the catalytic activity is proposed. The catalyst can be recovered and reused without loss of activity. The work-up of the reaction consists of a simple separation, followed by concentration of the crude product and purification. (C) 2011 Elsevier B.V. All rights reserved.
Succinimide-<i>N</i>-Sulfonic Acid: A Mild, Efficient, and Reusable Catalyst for the Chemoselective Trimethylsilylation of Alcohols and Phenols