13540-50-6Relevant articles and documents
The catalytic Friedel-Crafts alkylation reaction of aromatic compounds with benzyl or allyl silyl ethers using Cl2Si(OTf)2 or Hf(OTf)4
Shiina, Isamu,Suzuki, Masahiko
, p. 6391 - 6394 (2002)
The Friedel-Crafts alkylation reaction of various aromatic compounds with benzyl or allyl silyl ethers is effectively promoted under mild reaction conditions using Lewis acid catalysts. A mixture of the desired phenyltolylmethanes is obtained in 80% yield from toluene with benzyl dimethylsilyl or trimethylsilyl ether at 50°C in the presence of a catalytic amount of Cl2Si(OTf)2 or Hf(OTf)4.
Helical Al- and Ce-MCM-41 materials as novel catalyst for acid and redox processes
Carrillo, Adela I.,Serrano, Elena,Serrano-Ruiz, Juan Carlos,Luque, Rafael,Garcia-Martinez, Javier
, p. 1 - 9 (2012)
Helical mesoporous silicas containing aluminium or cerium into their framework have been synthesized via hydrothermal method. The synthesized materials were extensively characterized to understand their physico-chemical properties in view of their future catalytic applications. Low-angle powder XRD patterns of calcined samples showed a hexagonally ordered mesopore structure. NMR spectra of aluminium materials exhibited two signals at 50 and 0 ppm assigned to tetracoordinated and octahedrally coordinated Al3+. DR-UV-vis and XPS spectrum of cerium content materials show that cerium was incorporated as Ce3+ and Ce4+ into the helical mesoporous material. Materials with molar ratios Si/Al = 95 and Si/Ce = 500 were found to be catalytically active in acid (oxathioacetalisations and alkylations) or redox (epoxidation of cyclohexene) catalyzed processes, respectively.
Development of highly efficient Friedel-Crafts alkylations with alcohols using heterogeneous catalysts under continuous-flow conditions
Kobayashi, Shū,Koumura, Nagatoshi,Masuda, Koichiro,Okamoto, Yukiko,Onozawa, Shun-Ya
, p. 24424 - 24428 (2021/07/29)
The development of Friedel-Crafts alkylations with alcohols under continuous-flow conditions using heterogeneous catalysts is reported. The reactivities and durabilities of the examined catalysts were systematically investigated, which showed that montmorillonite clay is the best catalyst for these reactions. A high turnover frequency of 9.0 × 102h?1was recorded under continuous-flow conditions, and the continuous operation was successfully maintained over one week.
Selective Conversion of Benzylic Phosphates into Diarylmethanes Through Al(OTf)3-Catalyzed Friedel–Crafts-Type Benzylation
Yurino, Taiga,Hachiya, Asuka,Suzuki, Keisuke,Ohkuma, Takeshi
, p. 2225 - 2232 (2020/04/16)
Al(OTf)3 was identified as a high-performance catalyst for Friedel–Crafts-type benzylation using benzylic phosphates as electrophiles. The reaction proceeded even with 0.2 mol-% of the catalyst. A series of diarylmethanes (21 examples) was obtained in moderate to high yield. The catalyst showed unique chemoselectivity, preferentially converting the benzylic phosphate motif, even with a benzylic acetate group existed in the same molecule.
Benzylation of Arenes with Benzyl Halides under Promoter-Free and Additive-Free Conditions
Cheng, Xinqiang,Shan, Jiankai,Tian, Xinshe,Ren, Yun-Lai,Zhu, Yanyan
supporting information, p. 4404 - 4410 (2019/07/03)
It was found that benzyl chlorides and bromides could directly react with electron-rich arenes, which provided an example of promoter-free and additive-free benzylation of arenes. A variety of benzyl chlorides and bromides were treated with benzene rings to give the targeted products in low to high yields. The present conditions tolerated the vinyl group of the substrates. Preliminary mechanistic investigation suggests that the present reactions possibly proceed via an autocatalytic mechanism pathway.
