3 4-Dichlorophenylhydrazine hydrochloride（CAS# 19763-90-7)
Risk and Safety
| Risk Codes | R20/21/22 – Harmful by inhalation, in contact with skin and if swallowed. R36/37/38 – Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 – In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 – Wear suitable gloves and eye/face protection S36/37/39 – Wear suitable protective clothing, gloves and eye/face protection. S22 – Do not breathe dust. S24/25 – Avoid contact with skin and eyes. |
| UN IDs | 2811 |
| WGK Germany | 3 |
| HS Code | 29280000 |
| Hazard Note | Harmful/Irritant |
| Hazard Class | IRRITANT |
3 4-Dichlorophenylhydrazine hydrochloride（CAS# 19763-90-7) Information
| application | 3, 4-dichlorophenylhydrazine hydrochloride is a pharmaceutical intermediate that can be used to prepare biphenylpyridine. |
| preparation method | compound 3,4-dichloroaniline (38.88g,0.2399mol) is dissolved in dichloroethane (30ml), then 12mol/L concentrated hydrochloric acid (70ml,0.84mol) is added, sodium nitrite (18.06g,0.261mol) is added, the reaction solution is stirred at 5 ℃ for 30min, and the clarified liquid is filtered out, drop to 140ml of sodium sulfite solution containing (90.71g,0.7197mol), react at 80 ℃ for about 3 hours, react to produce 3,4-dichlorophenylhydrazine, add about (60ml,0.72mol) concentrated hydrochloric acid for 1 hour, stir overnight at room temperature, filter to obtain 3,4-dichlorophenylhydrazine hydrochloride white solid 46.1g, yield: 90%. |
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