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
Preparation method of pentafluorophenol
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Paragraph 0071; 0073, (2020/07/24)
The invention relates to the field of organic synthesis, in particular to a preparation method of pentafluorophenol. The preparation method of pentafluorophenol comprises the steps as follows: 1) pentafluorobenzonitrile and bromoacetic ester are subjected to a coupling reaction in the presence of zinc powder, hydrolysis and decarboxylation are performed under the acid condition, and pentafluoroacetophenone is prepared; 2) pentafluoroacetophenone is subjected to a Baeyer-Villiger reaction in the presence of an oxidizing agent, and pentafluorophenol is prepared after hydrolysis. The preparationmethod of pentafluorophenol comprises simple and short operation steps and is low in production cost, high in industrial operability and suitable for large-scale industrial 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.