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137557-26-7

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137557-26-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137557-26-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,5,5 and 7 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 137557-26:
(8*1)+(7*3)+(6*7)+(5*5)+(4*5)+(3*7)+(2*2)+(1*6)=147
147 % 10 = 7
So 137557-26-7 is a valid CAS Registry Number.

137557-26-7Relevant articles and documents

Ring Transformations of Heterocycles. Part 1. Transformation of 4-Amino-Δ2-1,2,4-oxadiazolines into 1,3,4-Oxadiazoles

El-Abadelah, M. M.,Nazer, M. Z.,Hussein, A. Q.,Awadallah, A. M.,Rademacher, P.,Woydt, M.

, p. 1229 - 1234 (2007/10/02)

3-Aryl-4-amino-Δ2-1,2,4-oxadiazolines 3 and their N-chloroacetyl derivatives 4, upon treatment with chloroacetic anhydride in refluxing toluene, afford 2-chloromethyl-5-aryl-1,3,4-oxadiazoles 5, suggesting the conversion sequence 3 -> 4 -> 5.The generality of the new ring transformation 4 -> 5 is supported similar conversion of other 4-(acylamino)-1,2,4-oxadiazolines 8 to 1,3,4-oxadiazoles 9.

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