The CAS registry number of 4-Methylpyrazole is 7554-65-6. Its EINECS registry number is 231-445-0. The IUPAC name is 4-methyl-1H-pyrazole. In addition, the molecular formula is C₄H₆N₂ and the molecular weight is 82.10. It is also called pyrazole, 4-methyl-. What's more, it is a kind of clear colourless to yellowish liquid after melting and belongs to the classes of Imidazoles, Pyrroles, Pyrazoles, Pyrrolidines. And it should be stored in a cool and dry place.

Physical properties about this chemical are: (1)ACD/LogP: 0.78; (2)ACD/LogD (pH 5.5): 0.77; (3)ACD/LogD (pH 7.4): 0.78; (4)ACD/BCF (pH 5.5): 2.27; (5)ACD/BCF (pH 7.4): 2.29; (6)ACD/KOC (pH 5.5): 62.29; (7)ACD/KOC (pH 7.4): 63.07; (8)#H bond acceptors: 2; (9)#H bond donors: 1; (10)Polar Surface Area: 17.82 Å²; (11)Index of Refraction: 1.523; (12)Molar Refractivity: 23.6 cm³; (13)Molar Volume: 77.2 cm³; (14)Polarizability: 9.35 ×10^-24cm³; (15)Surface Tension: 43.7 dyne/cm; (16)Density: 1.062 g/cm³; (17)Flash Point: 96.1 °C; (18)Enthalpy of Vaporization: 46.11 kJ/mol; (19)Boiling Point: 243.6 °C at 760 mmHg; (20)Vapour Pressure: 0.0497 mmHg at 25°C.

Preparation of 4-Methylpyrazole: it can be prepared by 4-methyl-5-trimethylsilanyl-1H-pyrazole. This reaction will need reagent aq. KOH and solvent ethanol. The reaction time is 1 hour by heating. The yield is about 68%.

Uses of 4-Methylpyrazole: it can be used as an antidote in confirmed or suspected methanol or ethylene glycol. It may be used alone or in combination with hemodialysis. In addition, it can react with trichloromethane to get tris(4-methylpyrazol-1-yl)methane. This reaction will need reagents K₂CO₃ and tetrabutylammonium bromide. The reaction time is 10 hours by heating. The yield is about 40%.

When you are using this chemical, please be cautious about it as the following:
This chemical is harmful if swallowed and irritating to eyes, respiratory system and skin. During using it, wear suitable protective clothing and avoid contact with skin and eyes. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: n1cc(cn1)C
(2)InChI: InChI=1/C4H6N2/c1-4-2-5-6-3-4/h2-3H,1H3,(H,5,6)
(3)InChIKey: RIKMMFOAQPJVMX-UHFFFAOYAT

The toxicity data is as follows: