Acetonitrile → Bromide ion

Reaction equation

[CH3:31][C:32]#[N:33].[N+:1](=[O:2])([O-:3])[c:4]1[cH:5][c:6]([CH2:7][Br:8])[cH:9][cH:10][cH:11]1.[c:12]1([P:18]([c:19]2[cH:20][cH:21][cH:22][cH:23][cH:24]2)[c:25]2[cH:26][cH:27][cH:28][cH:29][cH:30]2)[cH:13][cH:14][cH:15][cH:16][cH:17]1>>[Br-:8].[N+:1](=[O:2])([O-:3])[c:4]1[cH:5][c:6]([CH2:7][P+:18]([c:12]2[cH:13][cH:14][cH:15][cH:16][cH:17]2)([c:19]2[cH:20][cH:21][cH:22][cH:23][cH:24]2)[c:25]2[cH:26][cH:27][cH:28][cH:29][cH:30]2)[cH:9][cH:10][cH:11]1