1 - ethynyl - 4 - hexylbenzene ( 5 a ) 1 H NMR ( CDCl 3 , 300 ㎒): δ . 7 . 47 - 7 . 44 ppm ( d , 2 H , J = 8 . 11 ㎐), 7 . 19 - 7 . 16 ppm ( d , 2 H , J = 8 . 02 ㎐), 3 . 07 ppm ( s , 1 H ) , 2 . 67 - 2 . 62 ppm ( t , 2 H , J = 7 . 68 ㎐), 1 . 66 - 1 . 57 ppm ( m , 2 H ) , 1 . 34 ppm ( m , 6 H ) , 0 . 96 - 0 . 91 ppm ( t , 3 H , J = 6 . 34 ㎐)