A very efficient and mild procedure for preparation of silyl ethersfrom benzylic, allylic, propargilic alcohols, phenols, naphtoles and some of phenolic drugs with trimethylsilylchloride (TMSCl), triethylsilylchloride (TESCl) and t‐buthyldimethylsilyl chloride (TDSCl) ethers in the presence of Fe(HSO4)3/Et3N in room temperature in excellent yields is reported. This procedure also allows the excellent
在存在下,由苄基,烯丙基,丙二醇,苯酚,萘酚和某些酚类药物与三甲基氯硅烷(TMSCl),三乙基氯硅烷(TESCl)和叔丁基二甲基甲硅烷基氯(TDSCl)醚一起制备甲硅烷基醚的非常有效且温和的方法据报道,在室温下Fe(HSO 4)3 / Et 3 N具有极好的收率。该方法还使醇和酚的甲硅烷基化具有极好的选择性。
Hydrosilylation of Carbonyls Catalyzed by Hydridoborenium Borate Salts: Lewis Acid Activation and Anion Mediated Pathways
multinuclear NMR measurements for catalysts 1 and 2. The combined effect of carbonyl activation via the Lewisacidic hydridoborenium cation and the hydridic nature of the borate counteranion in 1 makes it a more efficient catalyst in comparison to that of carbonyl activation via the predominant Lewisacid activation pathway operating with catalyst 2. The catalytic cycle of 1 showed hydride transfer from
Bis(perfluoropinacolato)silane: A Neutral Silane Lewis Superacid Activates Si−F Bonds
作者:Florian S. Tschernuth、Thaddäus Thorwart、Lutz Greb、Franziska Hanusch、Shigeyoshi Inoue
DOI:10.1002/anie.202110980
日期:2021.12
Si-based Lewis superacid was synthesized by using highly electron-withdrawing perfluoropinacolato substituents. The formed silane was obtained as the acetonitrile mono-adduct and comprehensively characterized. The reaction with Et3SiF led to fluoride abstraction yielding the anionic fluorosilicate and the acetonitrile stabilized silylium ion. Catalysis screenings demonstrated high activity in Lewis acid
Molybdenum(VI) Bis(imido) Complexes: From Frustrated Lewis Pairs to Weakly Coordinating Cations
作者:Angela Milinkovic、Antoine Dupé、Ferdinand Belaj、Nadia C. Mösch‐Zanetti
DOI:10.1002/chem.202201867
日期:2022.10.4
Demonstration of how to teach well-known molybdenumbis(imido) complexes new and unexpected reactivities. These frustrated Lewis pairs (FLP) perform heterolytic dihydrogen splitting under ion pair formation consisting of molybdenum amido cations and hydroborates. They prove to be effective catalysts in the hydrosilylation of aldehydes. The molybdenum cations influence the outcome pointing towards their