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57005-69-3

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57005-69-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57005-69-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,0,0 and 5 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 57005-69:
(7*5)+(6*7)+(5*0)+(4*0)+(3*5)+(2*6)+(1*9)=113
113 % 10 = 3
So 57005-69-3 is a valid CAS Registry Number.

57005-69-3Relevant articles and documents

Reaction of pyridinium salts with active methylene group: Part I - Synthesis of 4-substituted 1,4-dihydropyridine derivatives

Fadda, A A

, p. 834 - 838 (2007/10/02)

The active methylene group in acetonitriles of the type CH2YZ (Y=CN, Z=R or Ar) (II) undergoes condensation readily with pyridinium salts (Ia-d) to yield 4-substituted 1,4-dihydropyridines.The active methylene group present in the thiazolidone (XIV) and oxazolone (XV) rings also react with 1 to give the corresponding 1,4-dihydro(thiazolono)-pyridines.

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