6397-82-6Relevant articles and documents
Friedel-Crafts acylation of anisole with hexanoic acid catalyzed by Hβ zeolite-supported tungstophosphoric acid
Bai, Guoyi,Zhang, Huanhuan,Li, Tianyu,Dong, Huixian,Han, Jie
, p. 5041 - 5048 (2015)
Friedel-Crafts acylation of anisole with hexanoic acid was studied and an efficient method was established for the green synthesis of 4-methoxy phenyl hexyl ketone over an Hβ zeolite-supported tungstophosphoric acid catalyst (HPW/Hβ). The conversion of hexanoic acid was 100 % and the yield of 4-methoxy phenyl hexyl ketone reached 89.2 % under the optimized reaction conditions over HPW/Hβ, due to the synergistic effect between HPW and Hβ zeolite. Inductively coupled plasma results indicated the dealumination of the Hβ zeolite due to the treatment of tungstophosphoric acid (HPW), offering more active centers in HPW/Hβ. X-ray diffraction and Brunauer-Emmett-Teller results demonstrated that HPW was highly dispersed on the surface and in the larger pores of the Hβ zeolite. NH3 temperature-programmed desorption results showed HPW/Hβ has larger amounts of strongly acidic sites than the Hβ zeolite, accounting for its good catalytic performance. Furthermore, this catalyst can be recycled for four times with the yield of 4-methoxy phenyl hexyl ketone maintained at roughly 70 %, demonstrating its relatively good stability.
AN IMPROVED AND COMMERCIALLY VIABLE PROCESS FOR PREPARATION OF ARYL KETONES
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Paragraph 0077; 0087, (2020/09/12)
The present disclosure provides a process for preparing an aryl ketone of Formula I, comprising reacting a substituted benzene of Formula II with a carboxylic acid of formula IIIa and/or a carboxylic anhydride of formula IIIb in presence of an alkyl sulfonic acid acting as catalyst cum solvent/contacting medium. I, II, IIIa, IIIb, wherein, R1, R2, R3 and R4 are as defined in the description.
Acylation of anisole with carboxylic acids catalyzed by tungsten oxide supported on titanium dioxide
Okumura, Kazu,Iida, Masaki,Yamashita, Hajime
, (2019/06/11)
Friedel-Crafts (F-C) acylation of anisole with octanoic acid was carried out on tungsten oxide (WO3) supported on various types of oxide supports. We have found that the highest activity was obtained when TiO2 was used as the support. WO3/TiO2 was found to be active in the acylation of anisole with carboxylic acids of varying alkyl chain lengths (C6–C10). It was possible to recycle the WO3/TiO2 catalyst for up to 5 times without deactivation. The turnover frequency (TOF) of the catalyst was closely correlated with the electronegativity of the cation of the support used for WO3. When a strong basic oxide such as CeO2 was used as a support, the acid strength of WO3 was diminished, while the strong acidity of WO3 was retained on a weak basic support like TiO2. This explains why the acid strength and consequently, the activity, were found to be the highest for the WO3/TiO2 catalyst. The trend of the catalytic performance was consistent with the order of acid strength of WO3 on different supports measured by temperature-programmed desorption of NH3.