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4,5-Dihydro-3-methyl-3H-pyrazole is an organic compound with the chemical formula C4H8N2. It is a colorless liquid with a molecular weight of 84.12 g/mol. This heterocyclic compound features a pyrazole ring, which consists of a five-membered ring with two nitrogen atoms and three carbon atoms, and an additional carbon atom attached to the ring, making it a dihydro derivative. The 3-methyl group indicates that there is a methyl group (CH3) attached to the third carbon atom of the pyrazole ring. 4,5-Dihydro-3-methyl-3H-pyrazole is used as a chemical intermediate in the synthesis of various pharmaceuticals, agrochemicals, and other industrial applications due to its unique structure and reactivity.

2721-25-7

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2721-25-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 2721-25-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,7,2 and 1 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 2721-25:
(6*2)+(5*7)+(4*2)+(3*1)+(2*2)+(1*5)=67
67 % 10 = 7
So 2721-25-7 is a valid CAS Registry Number.

2721-25-7SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 19, 2017

Revision Date: Aug 19, 2017

1.Identification

1.1 GHS Product identifier

Product name 3-methyl-1-pyrazoline

1.2 Other means of identification

Product number -
Other names 3-Methyl-Δ1-pyrazolin

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:2721-25-7 SDS

2721-25-7Downstream Products

2721-25-7Relevant academic research and scientific papers

Orientation in the 1,3-dipolar cycloaddition of diazomethane with alkylethylenes

Firestone, Raymond A.

, p. 2209 - 2212 (1980)

The regiochemistry of diazomethane cycloadditions with simple alkylethylenes, heretofore not reported, was investigated in the simplest case, diazomethane and propene. The products were 3-and 4-methylpyrazolines in 7.4/1 ratio, in accord with the diradical mechanism. This mechanism also accounts for the abnormal orientation in intramolecular cases and with bridgehead olefins.

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