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A solution of m-chloroperbenzoic acid, mCPBA, (1.40 gr, 8.11 mmol) in dichloromethane (30 ml) was added gradually to a solution of AF150(S) (1.45 gr, 7.88 mmol) in dichloromethane (10 ml). The reaction was stirred at room temperature overnight. Chromatography of the reaction mixture was on a column of natural aluminum oxide (Merck)(metanol:chloroform 1/49) gave AF406 (0.75 gr) as a crystalline solid. A sample was crystallized from ethylacetate. A very hygroscopic solid was obtained. mp. 130–132° C. (145–159° C. dec.); 1H NMR (300 MHz, CDCl3) δ 1.89 (m, 2H), 2.2 (t, j=1.5 Hz, CH3C═N), 2.82 (m, 2H), 3.24 (m, 2H), 3.25 (s, CH3N+O−), 3.35 (m, 2H), 4.03 (q, j=1.5 Hz, CH2N═C) ppm; IR(CHCl3) 2947, 1636, 1448, 1153, 931, 664 cm−1; MS(EI) 200 (M+), 184, 182, 149, 141, 140, 126, 110, 109, 108, 96, 82, 70.

1. customgave AF406 (0.75 gr) as a crystalline solid
2. customA sample was crystallized from ethylacetate
3. customA very hygroscopic solid was obtained