ChemicalBook >?? ???? >4-???-1-?????

4-???-1-?????

4-???-1-????? ??? ???

?? ??:: 15803-02-8

???:: 4-???-1-?????

???(??):: 4-???-1-?????

???:: 4-Bromo-1-methylpyrazole

???(??):: 4-BROMO-1-METHYL-1H-PYRAZOLE;4-Bromo-1-methylpyrazole;4-Bromo-1-Methyl-1-Pyrazol;1--4- MethylbroMidepyrazole;cyclopent-1-enecarbaldehyde;1-Mehtyl-4-Bromo-1H-Pyrazole;1- Methyl-4- broMinepyrazole;1-Methyl-4-bromo-1H-pyrazole;4-broMo-1-Methyl-1H-pyraz...;4-Bromo-1-methylpyrazole >

CBNumber:: CB8702674

???:: C4H5BrN2

??? ??:: 161

MOL ??:: 15803-02-8.mol

MSDS ??:: SDS

?? ?? 390

4-???-1-????? ??

?? ?: 185-188°C

??: 1.558

???: n20/D 1.531

???: 93°C

?? ??: Sealed in dry,Room Temperature

??? ??: ??

?? ?? (pKa): 0.21±0.10(Predicted)

??: ??~???

InChI: InChI=1S/C4H5BrN2/c1-7-3-4(5)2-6-7/h2-3H,1H3

InChIKey: IXJSDKIJPVSPKF-UHFFFAOYSA-N

SMILES: N1(C)C=C(Br)C=N1

CAS ??????: 15803-02-8(CAS DataBase Reference)

?? ? ?? ??
?? ? ???? ?? (GHS)

??? ??	Xi
?? ???? ??	37/38-41
?????	26-39
????(UN No.)	UN1760
WGK ??	3
?? ??	IRRITANT
HS ??	29331990
???? ???	10 - Combustible liquids
Hazard Classifications	Eye Dam. 1 Skin Irrit. 2 STOT SE 3

????(GHS):

?? ?:

Danger

??·?? ??:

??	??·?? ??	?? ??	??	?? ?	P- ??
H315	??? ??? ???	????? ?? ?????	?? 2	??	P264, P280, P302+P352, P321,P332+P313, P362
H318	?? ?? ??? ???	?? ? ?? ?? ??? ??	?? 1	??	P280, P305+P351+P338, P310
H335	?? ???? ??? ? ??	?? ???? ?? - 1? ??;???? ??	?? 3	??

??????:

P280	????/???/???/?????? ?????.
P302+P352	??? ??? ??? ?? ????.

NFPA 704

	1
2		0

4-???-1-????? C??? ??, ??, ??

??

4-Bromo-1-methylpyrazole is a colourless or light yellow liquid at room temperature and pressure. It can be used as an intermediate in organic synthesis. It has good solubility in common organic solvents such as ethyl acetate, dichloromethane, dimethyl sulfoxide, and N, N-dimethylformamide but poor solubility in water.

Synthesis

The conventional synthesis method of 4-Bromo-1-methylpyrazole starts from methyl pyrazole and uses NBS to brominate the carbon atom at position 4 in pyrazole using water as a solvent to obtain the target product. This synthetic route is fast and simple, with high yield and convenient post-processing. It is worth noting that the boiling point of this compound is not high, and low-temperature concentration should be paid attention to during post-processing. In addition, there is also a synthetic method using liquid bromine and hydrobromic acid aqueous solution as bromination reagents.

4-???-1-????? ?? ?? ? ???

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1-????? 4-?????? ???

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1-??-1H-???-4-??? 1-??-1H-???-4-??? Boronic acid, B-(1-methyl-1H-pyrazol-4-yl)-, bis(1-methylethyl) ester 4-???-1-?????-3-????? 1-??-4-(???????)-1H-???

4-???-1-????? ?? ??

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