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1,3-Bis(trifluoromethyl)benzene undergoes regioselective metalation and subsequent carboxylation at position 2 to give 2,6-bis(trifluoromethyl)benzoic acid. a convenient, selective synthesis of bis[2,4-bis(trifluoromethyl)phenyl]phosphane derivatives with 1,3-bis(trifluoromethyl)benzene as starting material.
Aeberli P,; Houlihan WJ. The Metalation of 1, 3-Bis (trifluoromethyl) benzene by n butyllithium.. J. Organomet. Chem. 1974, 64 (3), 321-25.
Berthold Hoge Dr.,; Boris Kurscheid,; Sebastian Peuker,; Wieland Tyrra,; Hendrik T. M. Fischer. A Convenient, Selective Synthesis of Bis[2,4-bis(trifluoromethyl)phenyl]phosphane Derivatives Starting from 1,3-Bis(trifluoromethyl)benzene . Zeitschrift für anorganische und allgemeine Chemie. 2007, 633 (10) ,679-1685 pg no.
Metallation with n-BuLi in diethyl ether is unselective, giving, on quenching with CO2, a mixture of 2,4- and 2,6-bis(trifluoromethyl)benzoic acids: J. Organomet. Chem., 67, 321 (1974). The superbasic n-BuLi/KO-t-Bu combination leads to almost exclusive 2-metallation, allowing the 2,6-bis(trifluoromethyl) acid to be isolated in 78% yield. In contrast, a combination of sec-BuLi and N,N,N',N',N'-pentamethyldiethylenetriamine leads to the 2,4-bis(trifluoromethyl) acid as the main product: Synlett, 747 (1990).
Dichiarazioni di rischio (UE): H226-H315-H319-H335
Flammable liquid and vapour. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Dichiarazioni precauzionali: P260-P201-P280g-P304+P340-P405-P501a
Do not breathe dust/fume/gas/mist/vapours/spray. Obtain special instructions before use. Wear protective gloves. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.