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1. Chlorination reaction (chlorine gas, thionyl chloride);
2. Bromination reaction;
3. Esterification;
4. O-alkylation reaction;
5. N-alkylation reaction (1500 tons/year continuous ammoniation unit);
6. Hoffman degradation;
7. Michael bonus;
8. Cyclization reaction;
9. Grignard reaction;
10. Hydrogenation reaction (10-100 kg pressure hydrogenation reaction device).