1 H NMR [ CDCl 3 , 300 MHz ] 7 . 9 ( m , 3 H ) , 7 . 6 ( m , 3 H ) , 7 . 4 ( m , 2 H ) , 6 . 9 ( t , 2 H , J = 8 . 8 , 8 . 7 Hz ) , 6 . 8 ( d , 1 H , J = 0 . 6 Hz ) , 6 . 6 ( dd , 1 H , J = 1 . 5 , 3 . 9 Hz ) , 3 . 3 ( s , 3 H ) , 3 . 0 ( q , 2 H , J = 7 . 5 , 7 . 8 Hz ) , 1 . 4 ( t , 3 H ) . 수율 = 76 %.