•
In pyridine and dichloromethane or ether, converts acid chlorides to trifluoromethyl ketones in good yields via a trifluoroacyl ketene intermediate: Tetrahedron, 51, 2573 (1995). The method has been extended to the synthesis of a range of trifluoromethylated heterocycles: Tetrahedron, 51, 2585 (1995):
• Trifluoroacetylating agent for protection of alcohols and amines: Helv. Chim. Acta., 37, 443 (1954); Tetrahedron,43, 5583 (1987); Tetrahedron Lett., 28, 4737 (1987), useful, e.g. as volatile derivatives in GC: J. Chromat., 43, 129 (1969); 61, 225 (1971); 93, 223, 447 (1974); D. R. Knapp, Handbook of Analytical Derivatisation Reactions, Wiley, N.Y. (1979); Handbook of Derivatives for Chromatography, 2nd ed., K. Blau and J. M. Halket, Eds., Wiley, Chichester (1993).
• Trifluoroacetyl esters are rapidly hydrolyzed at pH 7: Tetrahedron Lett., 1039 (1963). Trifluoroacetamides are also readily hydrolyzed e.g. by mild base; selective cleavage of a trifluoroacetamide can be achieved in the presence of a methyl ester: J. Org. Chem., 54, 2498 (1989). For the racemization-free removal of the N-trifluoroacetyl group from peptides by NaBH4, see: Chem. Ber., 103, 2437 (1970).
• Mild conversion of aryl halides to aryl trifluoromethyl ketones via Pd catalyzed stannylation: Synlett, 165 (1995).
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For the ɑ-trifluoroacetylation of a phosphonium salt in a route to perfluoroalkyl acetylenes, see: Org. Synth. Coll., 9, 436 (1998). For reaction scheme, see (Ethoxycarbonylmethyl)triphenylphosphonium bromide, A16347.•
Alternative to Oxalyl chloride, A18012, for activation of Dimethyl sulfoxide, A13280 in the low temperature Swern oxidation of alcohols to aldehydes or ketones: J. Org. Chem., 41,957 (1976); Tetrahedron, 34, 1651 (1978). This reagent often gives cleaner reactions and improved yields, e.g. in the synthesis of a sensitive 1,2-dione from the diol: J. Org. Chem., 52, 4851 (1987).• In pyridine, dehydrates carboxamides or aldoximes to nitriles: Tetrahedron Lett., 1813 (1977); Synthesis, 56, (1979). With triethylamine, effects the dehydration of aldols to enones, where other methods are less successful: Org. Synth. Coll., 8, 210 (1993).
Corrosive (C)
