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137566-61-1

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137566-61-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137566-61-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,5,6 and 6 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 137566-61:
(8*1)+(7*3)+(6*7)+(5*5)+(4*6)+(3*6)+(2*6)+(1*1)=151
151 % 10 = 1
So 137566-61-1 is a valid CAS Registry Number.

137566-61-1Relevant articles and documents

A concise, asymmetric synthesis of tetramic acid derivatives

Fustero, Santos,De La Torre, Marta Garcia,Sanz-Cervera, Juan F.,De Arellano, Carmen Ramirez,Piera, Julio,Simon, Antonio

, p. 3651 - 3654 (2002)

(graph presented) A simple, asymmetric synthesis of tetramic acid derivatives is described in this paper. The key step is a carbonyl transfer from carbonyldiimidazole (CDI) to α-diimines (I) to form N-alkyl-4-alkylamino-5-methylenepyrrol-2-ones (II). In t

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