USAF ek-7372
Thiocarbazide
CAS: 2231-57-4
Molecular Formula: CH6N4S
USAF ek-7372 - Names and Identifiers
| Name | Thiocarbazide |
| Synonyms | USAF ek-7372 Thiocarbazide thio-carbohydrazid Thiocarbohydrazide thiocarbonohydrazide Carbohydrazide, thio- 1,3-Diamino-2-Thiourea thiocarbonicdihydrazide Thiocarbonic dihydrazide Carbonothioic dihydrazide hydrazinecarbohydrazonothioicacid Hydrazinecarbohydrazonothioic acid |
| CAS | 2231-57-4 |
| EINECS | 218-769-8 |
| InChI | InChI=1/CH6N4S/c2-4-1(6)5-3/h2-3H2,(H2,4,5,6) |
USAF ek-7372 - Physico-chemical Properties
| Molecular Formula | CH6N4S |
| Molar Mass | 106.15 |
| Density | 1.273 (estimate) |
| Melting Point | 171-174°C (dec.)(lit.) |
| Boling Point | 230.1±23.0 °C(Predicted) |
| Flash Point | 93°C |
| Solubility | Very slightly soluble (0.5g/100g, 25°C). Insoluble in ether. |
| Vapor Presure | 0.067mmHg at 25°C |
| Appearance | White crystal |
| Color | White to gray-beige |
| BRN | 506657 |
| pKa | 10.58±0.70(Predicted) |
| Storage Condition | Keep in dark place,Sealed in dry,Room Temperature |
| Sensitive | Light Sensitive |
| Refractive Index | 1.5605 (estimate) |
| MDL | MFCD00007616 |
| Physical and Chemical Properties | This product is a white crystalline solid, industrial slightly gray, m. P. 171 ℃ (decomposition), insoluble in ether, ethanol insoluble, soluble in dilute acid, dilute alkali, soluble in hot water, slightly soluble in ice water. |
| Use | Widely used in organic synthesis, it is an important raw material for the production of high efficiency and broad spectrum herbicide |
USAF ek-7372 - Risk and Safety
| Hazard Symbols | T+ - Very toxic |
| Risk Codes | R5 - Heating may cause an explosion R26/28 - Very toxic by inhalation and if swallowed. R36/38 - Irritating to eyes and skin. R21 - Harmful in contact with skin |
| Safety Description | S28 - After contact with skin, wash immediately with plenty of soap-suds. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S38 - In case of insufficient ventilation, wear suitable respiratory equipment. S36/37 - Wear suitable protective clothing and gloves. S28A - S1 - Keep locked up. |
| UN IDs | UN 2811 6.1/PG 1 |
| WGK Germany | 3 |
| RTECS | FF2975000 |
| FLUKA BRAND F CODES | 4.4-8 |
| TSCA | Yes |
| HS Code | 29309090 |
| Hazard Class | 6.1 |
| Packing Group | I |
USAF ek-7372 - Upstream Downstream Industry
| Downstream Products | Metribuzin |
USAF ek-7372 - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | thiocarbazide is an intermediate of the herbicide meprozin. thiocarbazide is widely used in organic synthesis and is an important raw material for the production of high-efficiency broad-spectrum herbicide-prozin. |
| production method | its preparation method is to add carbon disulfide to a reaction kettle, cool it, add hydrazine hydrate dropwise under stirring, then raise the temperature to remove hydrogen sulfide gas, hydrogen sulfide is absorbed into sodium sulfide with alkali, the reaction liquid is cooled and crystallized, filtered, washed, the filtrate is used as mother liquor for circulation, and the washed filter cake is the finished product. It is obtained by the condensation of hydrazine hydrate and carbon disulfide. Cold the hydrazine hydrate aqueous solution to 15 ℃, and slowly add carbon disulfide, that is, white dithioyl hydrazide precipitates. After adding, stirring for half an hour, then heating to 80°C, the reactants begin to decompose. When heated to 93°C, the reaction is violent, and a large amount of thiohydrogen gas escapes. Continue heating for 3h, let stand overnight, filter out the crystallization, and re-crystallize with 4 times boiling water to obtain the finished product. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:01:54
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