1 H - NMR ( 400 Mz , CDCl 3 ) δ = 2 . 47 ( dd , 1 H , J 1 = 2 . 5 Hz , J 2 = 4 . 8 Hz ) , 2 . 76 ( td , 1 H , J 1 = 0 . 7 Hz , J 2 = 4 . 32 Hz ) , 2 . 89 ( dd , 1 H , J 1 = 5 . 77 Hz , J 2 = 13 . 89 Hz ) , 3 . 14 - 3 . 16 ( m , 1 H , CH ) , 6 . 99 - 7 . 46 ( m , 4 H , Ph ) .