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Name	4-Hydroxy-5-methyl-2-mercaptopyrimidine	EINECS	N/A
CAS No.	636-26-0	Density	1.36
PSA	80.74000	LogP	0.74090
Solubility	slight Stability Stable but may be heat or light sensitive. Incompatible with strong oxidizing agents. Toxicology Skin, eye and respiratory irritant. Possible sensitizer (on the basis of QSPR studies).	Melting Point	265-267 ºC
Formula	C5H6 N2 O S	Boiling Point	329.7oC at 760 mmHg
Molecular Weight	142.181	Flash Point	153.2oC
Transport Information	N/A	Appearance	white crystalline powder
Safety	Poison by unspecified route. Slightly toxic by intraperitoneal route. When heated to decomposition it emits toxic vapors of NO_x and SO_x.	Risk Codes	R22;R40;
Molecular Structure		Hazard Symbols	R22:Harmful if swallowed.; R40:Possible risks of irreversible effects.;
Synonyms	Thymine,2-thio- (6CI,8CI); 2-Thiothymine; 4-Hydroxy-5-methyl-2-mercaptopyrimidine;4-Hydroxy-5-methylpyrimidine-2-thione; 5-Methyl-2-thiouracil;5-Methyl-2-thioxo-2,3-dihydro-1H-pyrimidin-4-one; NSC 314272; NSC 9377;Thiothymine	Article Data	11

4-Hydroxy-5-methyl-2-mercaptopyrimidine Chemical Properties

Chemistry informtion about 2-Thiothymine (CAS NO.636-26-0) is:
IUPAC Name: 5-Methyl-2-Sulfanylidene-1h-Pyrimidin-4-One
Synonyms: 2,3-Dihydro-5-Methyl-2-Thioxo-4(1h)-Pyrimidinon ; 2,3-Dihydro-5-Methyl-2-Thioxo-4(1h)-Pyrimidinone ; 2-Thio-Thymin ; 2-Thiothymine ; 5-Methyl-2-Thioxo-2,3-Dihydro-4(1h)-Pyrimidinone ; Thiothymine ; Thymine, 2-Thio- ; Uracil, 5-Methyl-2-Thio-
Product Categories: PyrimidinE ; Pyridines, Pyrimidines, Purines and Pteredines
MF: C₅H₆N₂OS
MW: 142.18
Density: 1.36 g/cm³
Melting Point: 283-286°C
Flash Point: 160.8 °C
Boiling Point: 342.3 °C at 760 mmHg
Vapour Pressure: 3.83E-05 mmHg at 25°C
Enthalpy of Vaporization: 60.93 kJ/mol
BRN: 120488
Stability: Stable but may be heat or light sensitive. Incompatible with strong oxidizing agents.
Following is the molecular structure of 2-Thiothymine (CAS NO.636-26-0) is:

4-Hydroxy-5-methyl-2-mercaptopyrimidine Production

Raw materials are Etanol-->Hydrochloric acid-->Methanol-->Diethyl ether-->Acetic acid glacial-->Sodium-->Toluene-->Sodium sulfate-->Acetone-->Sodium bicarbonate-->Triethyl orthoformate-->Thiocarbamide-->ZINC-->Iodine-->Ethyl 2-bromopropionate .

4-Hydroxy-5-methyl-2-mercaptopyrimidine Toxicity Data With Reference

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
rabbit	LDLo	unreported	100mg/kg (100mg/kg)		Journal of Pharmacology and Experimental Therapeutics. Vol. 97, Pg. 478, 1949.
rat	LDLo	intraperitoneal	1gm/kg (1000mg/kg)		Journal of Pharmacology and Experimental Therapeutics. Vol. 97, Pg. 478, 1949.

4-Hydroxy-5-methyl-2-mercaptopyrimidine Consensus Reports

Reported in EPA TSCA Inventory.

4-Hydroxy-5-methyl-2-mercaptopyrimidine Safety Profile

Poison by unspecified route. Slightly toxic by intraperitoneal route. When heated to decomposition it emits toxic vapors of NO_x and SO_x.
Risk Statements:
R22:Harmful if swallowed.
R40:Limited evidence of a carcinogenic effect.
Safety Statements:
S22:Do not breathe dust.
S36/37:Wear suitable protective clothing and gloves.
RTECS: XP2108500

4-Hydroxy-5-methyl-2-mercaptopyrimidine Specification

2-Thiothymine (CAS NO.636-26-0) is a white crystalline solid.It is insoluble in water.It is heat sensitive and may be light sensitive and it is probably combustible.

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4-Hydroxy-5-methyl-2-mercaptopyrimidine