72163-18-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 72163-18-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,1,6 and 3 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 72163-18:
(7*7)+(6*2)+(5*1)+(4*6)+(3*3)+(2*1)+(1*8)=109
109 % 10 = 9
So 72163-18-9 is a valid CAS Registry Number.
72163-18-9Relevant articles and documents
A new synthesis of substituted α-methylene-γ-lactones
McCulloch,McInnes
, p. 1963 - 1966 (1979)
Ene reactions of suitably substituted olefins with dimethyl acetylenedicarboxylate give substituted 1,4-pentadiene-1,2-dicarboxylates, which undergo acid-catalyzed cyclization to α-carbomethoxymethylene γ-lactones.
