873-40-5 Usage
General Description
Pyrazine,2,3,5-trichloro- is a chemical compound with the molecular formula C4HCl3N and a molecular weight of 188.5 g/mol. It is a colorless to light yellow liquid with a pungent odor, and is primarily used as an intermediate in the manufacturing of pharmaceuticals, dyes, and pesticides. It is a highly reactive and toxic compound, with potential health hazards including skin and eye irritation, and respiratory and gastrointestinal effects if inhaled or ingested. As a result, it should be handled with caution and appropriate protective measures should be taken when working with this chemical. Additionally, disposal of this compound should adhere to local regulations and guidelines to minimize environmental impact.
Check Digit Verification of cas no
The CAS Registry Mumber 873-40-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 8,7 and 3 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 873-40:
(5*8)+(4*7)+(3*3)+(2*4)+(1*0)=85
85 % 10 = 5
So 873-40-5 is a valid CAS Registry Number.
InChI:InChI=1/C4HCl3N2/c5-2-1-8-3(6)4(7)9-2/h1H
873-40-5Relevant articles and documents
Favipiravir intermediate 3, 6-dichloro-2-cyanopyrazine synthesis process
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Paragraph 0014; 0043-0044; 0046-0059, (2021/07/17)
The present invention relates to a favipiravir intermediate 3, 6-dichloro-2-cyanopyrazine synthesis process, which is characterized in that the synthesis route is as follows as described in the specification. The cheap 2-chloropyrazine is used as the raw material, the product 3, 6-dichloro-2-cyanopyrazine can be obtained only through two-step reaction, the total yield is 55% or above, all the used reagents can be common reagents which can be purchased commercially, the production cost is reduced, and a synthesis process for large-scale industrial production of the 3, 6-dichloro-2-cyanopyrazine is achieved. According to the method disclosed by the invention, the synthesis process conditions are optimized, and particularly, the catalyst and the cocatalyst in the step (2) are selected, so that the yield and the purity of the product are further improved.
