乙醇 B Br t Br2 Br- Br OC H 2,3,4,5-四溴吡咯 C6HSN2Ci H20- N=N一C6H5 CH3COONa H H 吡咯偶氮苯N H + Br2 Br 0 C H N Br Br 乙醇 Br 2,3,4,5-四溴吡咯 H N H N C6H5N2Cl + - + H2O CH3COONa 乙醇 N=N C6H5 吡咯偶氮苯