620-22-4Relevant articles and documents
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Dalton,Regen
, p. 4443 (1979)
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Thermally stable imidazole/heteropoly acid composite as a heterogeneous catalyst for m-xylene ammoxidation
Jeon, Yukwon,Lee, Chanmin,Lee, Gicheon,Kwon, Ohchan,Kim, Jinsol,Park, Sang Sun,Oh, Kyeongseok,Shul, Yong-Gun
, p. 287 - 302 (2021)
Ammoxidation of m-xylene is evaluated in the presence of a customized heteropoly acid catalyst as an imidazole/molybdovanadophosphoric acid (imidazole/PMoV). Imidazole is employed to maintain its heterogeneous phase during the ammoxidation reaction and to provide the thermal stability of PMoV with the expectation that imidazole can generate strong electronic interactions with terminal molybdenum-oxygen on PMoV. The characterizations of the prepared catalysts are performed using SEM–EDX, XRD, FT-IR, Raman, XPS, and TGA to prove the physical and chemical changes by incorporating imidazole to PMoV, respectively. Also, the thermal stability of the developed catalyst is confirmed by the means of heat treatment test at relatively high temperature. The composite catalyst, imidazole/PMoV, shows an excellent conversion rate of over 98% with high selectivity of isophthalonitrile in m-xylene ammoxidation. Moreover, while the imidazole-free PMoV catalyst is deactivated and washed out during the reaction, the catalyst durability of the imidazole/PMoV is preserved without significant activity loss after 5 reaction cycles at 380 °C.
Synthesis method of m (p)-site alkyl substituted cyanobenzene
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Paragraph 0020-0023; 0026-0029, (2022/04/03)
The invention relates to a synthesis method of m (p)-alkyl substituted benzonitrile, which comprises the following steps: (1) m (p)-alkyl substituted benzoate is mixed with ammonia gas after passing through a vaporization furnace, the mixture enters a reactor filled with a catalyst to react, and a gas phase at an outlet of the reactor is introduced into a receiving tank with cooling water to obtain a reaction liquid; and (2) layering the reaction liquid in the step (1) to obtain an oil phase which is an m (p)-alkyl substituted cyanobenzene crude product, and rectifying to obtain an m (p)-alkyl substituted cyanobenzene finished product. According to the synthetic method disclosed by the invention, the m (p)-alkyl substituted cyanobenzene can be prepared only by a one-step method, the reaction only needs to be carried out in a tubular reactor filled with a catalyst, the process route is short, the production efficiency is high, the yield is high, the purity is good, the method is safe, economical and environment-friendly, and the obtained product is high in yield and purity.
Method for dehydrating primary amide into nitriles under catalysis of cobalt
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Paragraph 0051-0053, (2021/06/21)
The invention provides a method for dehydrating primary amide into nitrile. The method comprises the following steps: mixing primary amide (II), silane, sodium triethylborohydride, aminopyridine imine tridentate nitrogen ligand cobalt complex (I) and a reaction solvent under the protection of inert gas, carrying out reacting at 60-100 DEG C for 6-24 hours, and post-treating reaction liquid to obtain a nitrile compound (III). According to the invention, an effective method for preparing nitrile compounds by cobalt-catalyzed primary amide dehydration reaction by using the novel aminopyridine imine tridentate nitrogen ligand cobalt complex catalyst is provided; and compared with existing methods, the method has the advantages of simple operation, mild reaction conditions, wide application range of reaction substrates, high selectivity, stable catalyst, high efficiency, and relatively high practical application value in synthesis.
Pd/CoFe2O4/chitosan: A highly effective and easily recoverable hybrid nanocatalyst for synthesis of benzonitriles and reduction of 2-nitroaniline
Baran, Talat,Nasrollahzadeh, Mahmoud
, (2020/10/02)
In this study, a novel catalyst system with high activity and easy recoverability was successfully prepared through the deposition of Pd nanoparticles (NPs) onto designed sustainable hybrid beads containing magnetic cobalt ferrite and chitosan (Pd/CoFe2O4/chitosan). The catalytic potential of Pd/CoFe2O4/chitosan hybrid nanocatalyst was then assessed in i) preparation of benzonitriles via aryl halides cyanation and ii) reduction of 2-nitroaniline (2-NA). Various aryl iodides and bromides were successfully cyanated by Pd/CoFe2O4/chitosan hybrid nanocatalyst with excellent reaction yields within 3 h. In addition to the production of benzonitriles, the hybrid nanocatalyst showed excellent activity by reducing 2-NA in 65 s. It was proved that the Pd/CoFe2O4/chitosan hybrid nanocatalyst outperformed many catalysts used in the cyanation of aryl halides and catalytic reduction of 2-NA previously reported in the literature. Moreover, it was found that the designed Pd/CoFe2O4/chitosan hybrid nanocatalyst was easily and effectively separated from the reaction mixture using an external magnet and reused several times in catalytic reactions without considerable loss of catalytic activity.