1240503-56-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1240503-56-3 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,4,0,5,0 and 3 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1240503-56:
(9*1)+(8*2)+(7*4)+(6*0)+(5*5)+(4*0)+(3*3)+(2*5)+(1*6)=103
103 % 10 = 3
So 1240503-56-3 is a valid CAS Registry Number.
1240503-56-3Relevant academic research and scientific papers
Polyfunctional pyrazoles 5*. preparative synthesis of 1-aryl-4-formylpyrazole- 3-carboxylic acids
Bratenko,Barus,Vovk
experimental part, p. 1464 - 1468 (2010/07/08)
Treatment of methyl pyruvate N-arylhydrazones with the Vilsmeier-Haack reagent gave methyl 1-aryl-4-formylpyrazole-3-carboxylates, basic hydrolysis of which yielded the corresponding acids.
