Studies on selective preparation of aromatic compounds. 15. The Lewis acid catalyzed transalkylation of some tert-butyldiphenylmethanes and -ethanes in aromatic solvents
Bisulfate Salt-Catalyzed Friedel–Crafts Benzylation of Arenes with Benzylic Alcohols
作者:Ren-Jin Tang、Thierry Milcent、Benoit Crousse
DOI:10.1021/acs.joc.8b02361
日期:2018.11.16
We report here a method of direct Friedel–Craftsbenzylation of arenes with benzylic alcohols using cheap and readily available bisulfate salt as the catalyst in hexafluoroisopropanol. The catalytic system is powerful with a quite diverse group of functionalized arenes and benzylic alcohols. These mild conditions provide a straightforward synthesis of a variety of unsymmetrical diarylmethanes in high
Benzylation of arenes through FeCl3-catalyzed Friedel–Crafts reaction via C–O activation of benzyl ether
作者:Bi-Qin Wang、Shi-Kai Xiang、Zuo-Peng Sun、Bing-Tao Guan、Ping Hu、Ke-Qing Zhao、Zhang-Jie Shi
DOI:10.1016/j.tetlet.2008.04.117
日期:2008.6
Various benzyl ethers were converted to benzyl arenes via a FeCl3-catalyzed Friedel–Crafts alkylation reaction under mild condition in good yields. This method also offered a simple and practical approach to synthesize di- or tri-aryl methanes and aryl heteroaryl methanes through the activation of C–O bonds.
One catalyst fits all! One catalyst is active for a wide set of benzylating reactions (see scheme). A tandem process allows the use of aldehydes and ketones as benzylating agents.
An Effective Bismuth-Catalyzed Benzylation of Arenes and Heteroarenes
作者:Magnus Rueping、Boris J. Nachtsheim、Winai Ieawsuwan
DOI:10.1002/adsc.200606068
日期:2006.6
A highly efficient Bi(OTf)3-catalyzed benzylation of arenes and heteroarenes has been developed. The mild reaction conditions, high yields, operational simplicity and practicability, broad scope, and remarkably low catalyst loading render this environment friendly process an attractiv approach to diarylmethane derivatives. The extension to an intramolecular variant of this procedure provides a valuable
Synthesis of diarylmethanes via a Friedel–Crafts benzylation using arenes and benzyl alcohols in the presence of triphenylphosphine ditriflate
作者:Mohammad Mehdi Khodaei、Ehsan Nazari
DOI:10.1016/j.tetlet.2012.07.051
日期:2012.9
Triphenylphosphine ditriflate (TPPD) was found to be an efficient promoter for the Friedel–Craftsbenzylation of arenes with benzyl alcohols in CH2Cl2 at room temperature. The good yields, the 1:1 molar ratio of arene and benzyl alcohol, the benzylation of chlorobenzene as a nonactivated aromatic compound at room temperature, and no by-product formation are the main advantages of this procedure.