Methylthiouracil
Synonym(s):4-Hydroxy-2-mercapto 6-methylpyrimidine;Basethyrin;Methiocil;MZU;Thiothymin
- CAS NO.:56-04-2
- Empirical Formula: C5H6N2OS
- Molecular Weight: 142.18
- MDL number: MFCD00006040
- EINECS: 200-252-3
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-11-19 20:33:22
What is Methylthiouracil?
Chemical properties
white powder
The Uses of Methylthiouracil
antithyroid agent
The Uses of Methylthiouracil
6-?Methyl-?2-?thiouracil is a derivative of methylthiouracil (M330710), a competitive inhibitor of Nitric Oxide Synthase (NOS). Potential anti-inflammatory agent.
Definition
ChEBI: Methylthiouracil is a pyrimidone.
General Description
White crystalline powder with an odor of onions and a bitter taste. A saturated aqueous solution is neutral or slightly acidic.
Air & Water Reactions
Insoluble in water.
Reactivity Profile
Methylthiouracil reacts with strong oxidizing agents. Forms complexes with metals and is oxidized by iodine and other sulfhydryl oxidizing agents .
Fire Hazard
Flash point data for Methylthiouracil are not available. Methylthiouracil is probably combustible.
Safety Profile
Confirmed carcinogen with experimental carcinogenic, neoplastigenic, tumorigenic, and teratogenic data. Poison by intraperitoneal route. Moderately toxic by ingestion. Human teratogenic and reproductive effects by an unspecified route: developmental abnormalities of the endocrine system and effects on newborn including neonatal measures or effects. Experimental reproductive effects. Used to treat hyperthyroidism. When heated to decomposition it emits very toxic fumes of NOx and SOx.
Purification Methods
Crystallise the thiouracil from a large volume of H2O. Purify it further by dissolving in base, adding charcoal, filtering and acidifying with AcOH. Suspend the wet solid (ca 100g) in boiling H2O (1L), stir and add AcOH (20mL), stir and refrigerate. Collect the product, wash it with cold H2O (4 x 200mL), drain it for several hours then place it in an oven at 70o to constant weight. [IR: Short & Thompson J Chem Soc 168 1952, Foster & Snyder Org Synth Coll Vol IV 638 1063, Beilstein 24 III/IV 1289.]
Properties of Methylthiouracil
Melting point: | ~330 °C (dec.)(lit.) |
Density | 1.291 (estimate) |
refractive index | 1.6430 (estimate) |
storage temp. | Keep in dark place,Sealed in dry,Room Temperature |
solubility | DMSO (Heated), Methanol (Slightly, Heated) |
form | Liquid |
pka | pKa 8.2 (Uncertain) |
color | Clear colorless to yellow |
Water Solubility | INSOLUBLE |
Merck | 14,6128 |
BRN | 115648 |
Stability: | Incompatible with strong oxidizing agents, iodine, metals. |
CAS DataBase Reference | 56-04-2(CAS DataBase Reference) |
IARC | 2B (Vol. Sup 7, 79) 2001 |
NIST Chemistry Reference | 6-Methyl-2-thiouracil(56-04-2) |
EPA Substance Registry System | Methylthiouracil (56-04-2) |
Safety information for Methylthiouracil
Signal word | Warning |
Pictogram(s) |
Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H317:Sensitisation, Skin |
Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P272:Contaminated work clothing should not be allowed out of the workplace. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P333+P313:IF SKIN irritation or rash occurs: Get medical advice/attention. |
Computed Descriptors for Methylthiouracil
InChIKey | HWGBHCRJGXAGEU-UHFFFAOYSA-N |
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