70253-78-0Relevant articles and documents
Method for preparing fatty acid trifluoro-ethyl ester without catalysts or condensation agents
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Paragraph 0024; 0025, (2017/07/01)
The invention discloses a method for preparing fatty acid trifluoro-ethyl ester without catalysts or condensation agents. The method includes steps of mixing fatty acid and alkali with each other to obtain mixtures; adding trifluoro-ethyl aryl trivalence iodine reagents into the mixtures; carrying out stirring reaction at the temperatures ranging from -20 DEC C to 100 DEG C for 1-72 h to obtain reaction products. A molar ratio of the fatty acid to the trifluoro-ethyl aryl trivalence iodine reagents is 1:(0.2-5); a molar ratio of the fatty acid to the alkali is 1:(0.2-5). The method has the advantages that the catalysts and the condensation agents can be omitted, and even organic solvents can be omitted; the trifluoro-ethylation reagents PhICH2CF3[X] can be conveniently synthesized from CF3H2I; raw materials for the fatty acid trifluoro-ethyl ester are easily available, reaction conditions are mild, functional groups are good in compatibility, substrates are wide in application range, the method is easy to implement, and the target products nearly can be obtained under the condition of quantitative yields.
Acid-Catalyzed Reaction of 2,2,2-Trifluorodiazoethane for Analysis of Functional Groups by 19F Nuclear Magnetic Resonance Spectrometry
Koller, K. L.,Dorn, H. C.
, p. 529 - 533 (2007/10/02)
The acid-catalyzed reactions of trifluorodiazoethane with alcohols, phenols, thiols, and carboxylic acids are reported.The yield data for these trifluoroethyl derivatives suggest a simple, and in many cases, quantitative method for introduction of a fluorine tagging group.The 19F chemical shifts indicate that most functional groups (e.g., phenols, alcohols, etc.) have fairly well resolved chemical shifts regions.In addition, paramagnetic shift reagents have been utilized to selectively differentiate carboxylic acids from other active hydrogen functional groups.