500-22-1Relevant articles and documents
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Suvorov et al.
, (1969)
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Selective photocatalytic oxidation of 3-pyridinemethanol on platinized acid/base modified TiO2
?etinkaya, S?d?ka,Augugliaro, Vincenzo,Garlisi, Corrado,Lewin, Erik,Palmisano, Giovanni,Sá, Jacinto,Yurdakal, Sedat
, p. 4549 - 4559 (2021)
TiO2catalysts, modified with acidic or alkaline solutions and then platinized, were used for the partial photocatalytic oxidation of 3-pyridinemethanol to 3-pyridinemethanal and vitamin B3under environmentally friendly conditions. The reaction took place in water under UVA light and air oxygen. Catalysts were characterized by TEM, photoluminescence, DRIFT-IR, Raman, DRS, XPS, and photocurrent measurements. The photocatalytic activity results show that Pt loading of untreated samples leads to a significant activity improvement (hence product yield) as much as acid and alkaline treatments do. Moreover, the alkaline treated TiO2samples exhibit a further increase in activity after loading with Pt. Pt acts as an electron scavenger promoting electron transfer from the TiO2conduction band, consequently boosting the photogenerated pair numbers available for the reactive process. Photocurrent measurements show that the TiO2photocatalysts' active sites increase significantly after platinization and alkaline/acid treatment. The treated and/or Pt loaded catalysts showed good thermal stability (at least up to 400 °C).
Mild reductive deoximation with TiCl4/NaI reagent system
Balicki,Kaczmarek
, p. 1777 - 1782 (1991)
The application of the TiCl4/NaI reagent system in the reductive cleavage of oximes under mild conditions is reported.
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Schoenberg,A.,Heck,R.F.
, p. 7761 - 7764 (1974)
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Micellar effects on kinetics and mechanism of Vilsmeier–Haack formylation and acetylation with Pyridines
Alyami, Bandar A.,Iqubal, S. M. Shakeel,Khan, Aejaz Abdullatif,Mohammed, Tasneem
, (2022/01/19)
An efficient preparation of Vilsmeier–Haack formylated and acetylated derivatives with pyridine and substituted pyridines has been developed by employing micelles as catalyst. Their kinetic study reveals a phenomenal rate enhancement in anionic SDS, cationic CTAB, and nonionic TX-100 micellar media. The Vilsmeier–Haack reaction follows second order kinetics. Piszkiewicz’s co-operativity model was used to interpret the results in micellar media. The observed activation parameters ΔH and ΔS values were calculated from Eyring’s plots. The main features of this study were easy process, mild reaction conditions and readily available reagents. Graphical abstract: [Figure not available: see fulltext.].
Novel pymetrozine intermediate nicotinaldehyde synthesis method and synthesis device
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Paragraph 0041-0046, (2021/03/31)
The invention discloses a novel pymetrozine intermediate nicotinaldehyde synthesis method. The method comprises the following steps: preparing a mixed solution; adding a main catalyst and a cocatalyst; and carrying out a reaction, cooling a reaction product, performing pressure reduced distillation and filtration to obtain a nicotinaldehyde solution. The invention further discloses synthesis equipment adopting the novel pymetrozine intermediate nicotinaldehyde synthesis method, the synthesis equipment comprises a reaction kettle, a stirring shaft and a reduced pressure distiller, the stirringshaft is arranged in the reaction kettle and is rotatably connected with the reaction kettle, the reduced pressure distiller is connected with the reaction kettle, and the reduced pressure distiller is connected with the reaction kettle and is located at the lower side of the reaction kettle. According to the present invention, the main catalyst and the co-catalyst are matched with each other, andthe experiment conditions are controlled, such that the process steps are simple and can be suitable for large-scale production, and the synthesis apparatus of the nicotinaldehyde synthesis method step is improved; the reaction kettle and the reduced pressure distiller are matched so as to improve the yield of the nicotinaldehyde; therefore, the product can be automatically produced, and the nicotinaldehyde can be produced on a large scale.