4 - Bromohexanoylbenzene ( 1 a ) : 1 H NMR ( CDCl 3 , 300 ㎒): δ 7 . 81 - 7 . 86 ppm ( d , 2 H , J = 8 . 61 ㎐), 7 . 58 - 7 . 55 ppm ( d , 2 H , J = 8 . 80 ㎐), 2 . 93 - 2 . 88 ppm ( t , 2 H , J = 7 . 36 ㎐), 1 . 76 - 1 . 66 ppm ( m , 2 H ) , 1 . 36 - 1 . 34 ppm ( m , 4 H ) , 0 . 92 - 0 . 88 ppm ( t , 3 H , J = 6 . 81 ㎐)