Microwave-assisted rapid and efficient deprotection and direct esterification and silylation of MOM and EOM ethers catalyzed by [Hmim][HSO4] as a Brønsted acidic ionic liquid
Abstract1-Methylimidazolium hydrogensulfate, [Hmim][HSO4], a Brønstedacidic room temperature ionicliquid, is used as a catalyst and reaction medium for facile and eco-friendly deprotection of methoxymethyl (MOM) and ethoxymethyl (EOM) ethers to their corresponding alcohols under thermal conditions (Δ) and microwave irradiation (MW). Furthermore, one-pot interconversion to the respective acetates and
BiCl<sub>3</sub>-Facilitated removal of methoxymethyl-ether/ester derivatives and DFT study of –O–C–O– bond cleavage
作者:Angela Pacherille、Beza Tuga、Dhanashree Hallooman、Isaac Dos Reis、Mélodie Vermette、Bilkiss B. Issack、Lydia Rhyman、Ponnadurai Ramasami、Rajesh Sunasee
DOI:10.1039/d1nj00449b
日期:——
simple method for the cleavage of methoxymethyl (MOM)-ether and ester derivatives using bismuth trichloride (BiCl3) is described. The alkyl, alkenyl, alkynyl, benzyl and anthracene MOM ether derivatives, as well as MOM esters of both aliphatic and aromatic carboxylic acids, were deprotected in good yields. To better understand the molecular roles of BiCl3 and water for MOM cleavage, two possible binding
A Facile Preparation of Methoxymethyl Ethers of Primary and Secondary Alcohols with Dimethoxymethane Catalysed by Expansive Graphite
作者:Tong-Shou Jin、Tong-Shuang Li、Yong-Tao Gao
DOI:10.1080/00032719808006481
日期:1998.3.1
Abstract An easy preparation of methoxymethyl ethers of primary and secondary alcohols with dimethoxymethane has been carried out in excellent yield under catalysis of expansive graphite.
摘要 在膨胀石墨的催化下,以二甲氧基甲烷简单地制备了伯醇和仲醇的甲氧基甲基醚,收率良好。
Lithium Bromide, a Novel and Highly Effective Catalyst for Monothioacetalization of Acetals under Mild Reaction Conditions
作者:Fumiaki Ono、Ryojyu Negoro、Tsuneo Sato
DOI:10.1055/s-2001-17477
日期:——
Lithium bromide is efficient as a catalyst for the monothioacetalization of acetals under mild reaction conditions to provide products in excellent yields with high chemoselectivity.
Aluminium trichloride catalyses the expeditious direct conversion of tetrahydropyranylethers to silyl ethers. This one-step transformation is chemoselective versus deprotection of the acetal and hydrosilylation of unsaturated carbon–carbon bonds, and can also be applied to linear acetals. A possible mechanism is tentatively proposed.