2 -( 4 - decyloxyphenyl ) ethynyl ) trimethylsilane ( 4 c ) 1 H NMR ( CDCl 3 , 300 ㎒): δ 7 . 43 - 7 . 40 ppm ( d , 2 H , J = 8 . 84 ㎐), 6 . 84 - 6 . 81 ppm ( d , 2 H , J = 8 . 86 ㎐), 3 . 98 - 3 . 94 ppm ( t , 2 H , J = 6 . 58 ㎐), 1 . 81 - 1 . 74 ppm ( m , 2 H ) , 1 . 30 ppm ( m , 14 H ) , 0 . 93 - 0 . 89 ppm ( t , 3 H , J = 6 . 70 ㎐), 0 . 26 ppm ( s , 9 H )