771-61-9Relevant articles and documents
Tetra-cmpo-derivatives of calix[4]arenes fixed in the 1,3-alternate conformation
Dordea, Crenguta,Brisach, Frederic,Haddaoui, Jaouad,Arnaud-Neu, Francoise,Bolte, Michael,Casnati, Alessandro,Boehmer, Volker
, p. 347 - 357 (2010)
Calix[4]arene derivatives fixed in the 1,3-alternate conformation and substituted at one side by four carbamoylmethyl-phosphine oxide (CMPO) residues were synthesised. Two CMPO groups are directly attached to the wide rim, while the second pair is bound to the narrow rim via a tri- or tetramethylene spacer. Similar compounds, in which two CMPO groups at the wide rim are combined with two picolinamide groups or two ionisable carboxylic groups at the narrow rim, were also prepared. Some of these calixarene derivatives were studied as extractants for lanthanides (La3+,Eu3+,Yb3+) and thorium (Th4+) from acidic solution into methylene chloride. For selected samples, stability constants in methanol were determined by spectrophotometric titrations. Three compounds (1b′, 13, 17) in the 1,3-alternate conformation and one intermediate in the cone conformation (18) were confirmed by a crystal structure.
Self anion radical induced breaking carbon–oxygen bond in bay area of perylene diimide, and nucleophilic substitution with SRN1 mechanism
Guo, Zhun,He, Zemin,Miao, Zongcheng,Zhang, Haiquan,Zhang, Huimin,Zhao, Yang,Zhao, Yuzhen
supporting information, (2022/02/09)
Perylene diimide and its various derivatives tend to form their anion radicals after obtaining one electron, which will alter their chemical properties. Herein, we reported firstly synthesis of the unsymmetrically substituted perylene diimide in bay area
Method for continuously preparing pentafluorophenol by micro-reactor
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Paragraph 0027-0038, (2020/05/16)
The invention relates to a method for continuously preparing pentafluorophenol by a microreactor, which belongs to the field of chemical production processes. The method comprises the following steps:simultaneously pumping hexafluorobenzene and an inorganic alkali aqueous solution into a micro-channel reactor by using a metering pump respectively, and mixing for a hydrolysis reaction; keeping thetemperature of the reactor at 130-170 DEG C, controlling and maintaining the pressure of a pipeline at 0.5-1.0 Mpa by an outlet quantitative pressure control valve, connecting an outlet with a heat exchanger, obtaining an aqueous solution of pentafluorophenolate from the outlet of the heat exchanger, adding hydrochloric acid steam, distilling to obtain an oil layer, and rectifying and dehydratingthe oil layer to obtain pentafluorophenol. The method is simple in process, low in cost, free of amplification effect and capable of achieving continuous production.
Preparation method of pentafluorophenol
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Paragraph 0024-0025; 0026-0027; 0028-0029; 0030-0031, (2019/03/08)
The invention relates to a preparation method of pentafluorophenol, and belongs to the field of chemical production technologiesprocesses. The preparation method of the pentafluorophenol is carried out according to the following technologies processes that hexafluorobenzene, strong base and water are put in a sealed container, to be prepared intothus a mixed solution is prepared, heat preservationis conducted at the temperature of 100-150 DEG C for reaction, and thus a system solution is obtained; the system solution is neutralized until the pH value is not higher than 6, then a coarse product is extracted, rectification is conducted, and the pentafluorophenol is obtained. According to the preparation method, the cost is low, organic matter and heavy metal are not adopted except for substrate, pollution is small, side reactions is are lessfewer, the reaction steps are simple, and operation is easy.