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4.3.4. (3E,5E)-1,1-Diethoxynona-3,5-dien-2-one (2c) When 1c (0.23 g, 1.0 mmol) was reacted following the general procedure, 0.18 g (79%) of 2c was afforded as a yellowish oil. 1H NMR (CDCl3, 500 MHz): δ 7.41–7.35 (m, 1H), 6.43 (d, J = 15.4 Hz, 1H), 6.27...