| 1 | Some method about synthesis of piperazine with aliphatic amine were introduced. | |
| 2 | Another way was to combine directly anhydrous piperazine with 2,3-dichloro- bromobenzene through Ullmann reaction. | |
| 3 | Six kinds of substituted piperazine were synthesized, and the structures of these compounds were identified by 1HNMR?IR and elemental analysis. | |
| 4 | Compounds 79 were obtained by reaction of cyclic aminomethyl or ethyl chlorides and 1-pyridylmethylpiperazines. | |
| 5 | A kind of new diamine monomer of modified polyimide with piperazine was synthesized, which has been used in the synthesis of modified polyimide by ternary copolymerization. |
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