Dehydrative Coupling of Benzylic Alcohols Catalyzed by Brønsted Acid/Lewis Base
作者:Marlene Böldl、Ivana Fleischer
DOI:10.1002/ejoc.201900965
日期:2019.9.15
A combination of Brønsted acid and Lewis base catalyses two dehydrative transformations of benzylic alcohols: homocoupling and hydroarylation.
布朗斯台德酸和路易斯碱的组合催化苄醇的两个脱水转化:均偶联和氢芳基化。
Highly Efficient, Reversible Addition of Activated Methylene Compounds to Styrene Derivatives Catalyzed by Silver Catalysts
作者:Xiaoquan Yao、Chao-Jun Li
DOI:10.1021/jo050570n
日期:2005.7.1
A highlyefficient inter- and intramolecular addition of 1,3-diketone/β-ketoester to alkenes was developed by using silver catalysts. Silver triflate shows the highest catalytic activity. The reaction is reversible through the cleavage of a carbon−carbon bond by silver at an elevated temperature.
Novel ruthenium-catalyzed reactions that employ ruthenium trichloride n-hydrate (RuCl3·nH2O) were investigated and dimerization, alkoxylation and sulfidation of olefins were noted. Adducts of Markovnikov type and anti-Markovnikov type were obtained in a stereospecific manner and in good yield, depending on the type of olefins used as the starting materials.
Brønsted Acid-Catalyzed Benzylation of 1,3-Dicarbonyl Derivatives
作者:Roberto Sanz、Delia Miguel、Alberto Martínez、Julia M. Álvarez-Gutiérrez、Félix Rodríguez
DOI:10.1021/ol070624a
日期:2007.5.1
The direct alkylation of 1,3-dicarbonylcompounds with benzylic alcohols is shown to be efficientlycatalyzed by simple Bronsted acids such as triflic acid (TfOH) and p-toluenesulfonic acid (PTS) to give rise to monoalkylated dicarbonyl derivatives in high yields. In the absence of the nucleophile, substituted alkenes, generated through a formal dimerization reaction, are obtained. The reactions are
Iron-Catalysed Regio- and Stereoselective Head-to-Tail Dimerisation of Styrenes
作者:Jose R. Cabrero-Antonino、Antonio Leyva-Pérez、Avelino Corma
DOI:10.1002/adsc.201000096
日期:——
Cationic iron salts and complexes catalyse the head‐to‐tail dimerisation of styrene derivatives to form the corresponding dimers with good to excellent yields and stereoselectivities. In particular, the use of a phosphine‐iron(III) complex allows the recovery and reuse of the catalyst. The counteranion plays an important role in both the activity and selectivity. These catalysts constitute an alternative