( 2 -( 4 - decylphenyl ) ethynyl ) trimethylsilane ( 4 b ) 1 H NMR ( CDCl 3 , 300 ㎒): δ 7 . 52 - 7 . 47 ppm ( dd , 2 H , J = 8 . 17 ㎐, J = 8 . 53 ㎐), 7 . 21 - 7 . 12 ppm ( dd , 2 H , J = 7 . 98 ㎐, J = 8 . 20 ㎐), 2 . 72 - 2 . 62 ppm ( m , 2 H ) , 1 . 69 ppm ( m , 2 H ) , 1 . 9 ppm ( s , 9 H ) , 1 . 27 - 1 . 22 ppm ( m , 14 H ) , 1 . 04 - 0 . 99 ppm ( t , 3 H , J = 6 . 53 )