Triethylamine → N-tert-Butyl-alpha-(4-bromophenyl)nitrone

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By anaolgy to the procedure for the synthesis described above, 5.024 g (40.0 mmol) of N-tert-butylhydroxylamine hydrochloride (1) were reacted with 6.476 g (35.0 mmol) of 4-bromobenzaldehyde (2c) in 100 mL of anhydrous toluene, and in the presence of 4.554 g (45 mmol, 6.27 mL) of Et3N and 8.425 g (70.0 mmol) of MgSO4. Purification of the crude yellow oil by column chromatography (silica gel, EtOAc/hexanes=1:6 to 1:3) yielded 8.95 g (quant.) of colorless crystals. Rf: 0.25 (EtOAc/hexanes=1:4, UV254-quenching). 1H NMR (300 MHz, CDCl3, room temp.): δ8.14 (dt, J=8.7,2.4 Hz, 2H, Ar-H), 7.49 (dt, superimposed, J=8.7,2.4 Hz, 2H, Ar-H), 7.48 (s, superimposed, 1H, HC(═N)), 1.56 (s, 9H, C(CH3)3) ppm. 13C NMR (75 MHz, CDCl3, room temp.): δ131.53, 130.06, 129.81, 128.92, 123.73, 71.09, 28.20 ppm.

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