Benzaldehyde → Benzylidene Dihexanoate

Beteiligte Stoffe

Reaktionsschritte

Benzaldehyde (26.3 g, 0.25 mol) and hexanoic acid anhydride (53.3 g, 0.25 mol) were dissolved in carbontetrachloride (200 ml) under N2 -atrnosphere. Catalytic amounts of sulfuric acid was added and the reaction mixture stirred at room temperature for 1 hr. The reaction mixture was evaporated over night, the residue dissolved in hexane and the solution filtered through a bed of silica. The filtrate was purified on a silica column, eluting with hexane. The evaporated eluate was a colourless oil and the yield was 14.0 g, 18% of the theoretical. 1H- and 13C NMR (CDCl3) d (ppm) rel. to TMS: 7.72 (s, 1H, CH(OC5H11)2), 7.58-7.39 (m, 5H, Ar-H), 2.37 (double t, 4 H, COCH2), 1.64 (m, 4H, COCH2CH2), 1.30 (m, 4H,CH2CH2CH3) and 0.88 (t, 6H, CH3); 171.524 (C=O), 135.688, 129.523, 128.466 and 126.547 (Ar), 89.398 (CH(OC5H11)2), 33.965, 31.030, 24.235 and 22.179 (CH2) and 13.777 (CH3).

Herkunft & Nachweise