13319-69-2Relevant articles and documents
A kind of alkali to promote self-oxidation of diaryl alkane preparation diarylketones method (by machine translation)
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Paragraph 0019, (2017/08/28)
The invention discloses a kind of alkali to promote self-oxidation of diaryl alkane preparation diarylketones method. The method is that the diaryl paraffins compound is dissolved in an organic solvent in the drying of, the addition of a base, in the 25 - 80o C reaction under air or oxygen atmosphere for 0.5 - 5 hours, to obtain diarylketones; said two aryl paraffins compound and alkali molar ratio of 1:1 - 1:3. The method overcomes the need in the prior art strong acid or expensive metal reagent or a strong oxidizing agent and the like, has the following advantages: 1) to oxygen as the oxidizing agent, avoids the use of strong or expensive chemical oxidizing agent; 2) transition metal-free catalyst, avoids the heavy metal ion in the product; 3) the process is simple, low cost, wide range of the substrate, friendly to the environment. The synthesis method disclosed in this invention in the preparation of diarylketones industrialization of the play an important role in the production. (by machine translation)
Polystyrene supported Al(OTf)3: An environmentally friendly heterogeneous catalyst for Friedel-Crafts acylation of aromatic compounds
Boroujeni, Kaveh Parvanak
experimental part, p. 3156 - 3158 (2012/05/20)
Stable and non-hygroscopic polystyrene supported aluminium triflate (Ps-Al(OTf)3), which is prepared easily from cheap and commercially available compounds was found to be an environmentally friendly heterogeneous catalyst for Friedel-Crafts acylation of arenes using acid chlorides in the absence of solvent under mild reaction conditions. The catalyst can be reused up to five times after simple washing with dichloromethane.
Friedel-crafts benzoylation of alkylbenzenes with brazoic anhydride catalyzed by solid superacids
Nakamura, Hideo,Arata, Kazushi
, p. 1893 - 1896 (2007/10/03)
The liquid-solid phase benzoylation of mono-alkylbenzenes with methyl, ethyl, propyl, and butyl groups and xylenes was carried out with benzoic anhydride at 100-110°C over solid superacids: SO4/ZrO 2, WO3/ZrO2, and SO4/ HfO 2. The reactivity ratio obtained by the competitive method of reaction over WO3/ZrO2 was 1 to 4.6 for toluene to p-xylene and 1.1:10:1 among o-, m-, and p-xylenes, respectively. Although the SO4/ZrO2 catalyst gave high yields of 92 and 97% for toluene and ethylbenzene in a 3:7 distribution of o- and p-isomers, respectively, low yields were observed with propyl and butylbenzenes over the catalyst: that is, 5 and 2% for propylbenzene and isopropylbenzene, 14% for isobutylbenzene, and trace yields for butylbenzene, s-butylbenzene, and t-butylbenzene, respectively. The usual Friedel-Crafts benzoylation using AlCl3 was examined in the present alkylbenzenes in order to confirm the low reactivity of both propyl and butylbenzenes. The results were similar to those with the SO4/ZrO2 catalyst; that is, the yields at 0°C for 1 h were 37, 21, 6, 1, 0, 3, and 2% for toluene, ethylbenzene, propylbenzene, isopropylbenzene, butylbenzene, s-butylbenzene, and t-butylbenzene, respectively, showing an unexpected result where there was no distinction between homogeneous and heterogeneous conditions.
