131657-53-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 131657-53-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,6,5 and 7 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 131657-53:
(8*1)+(7*3)+(6*1)+(5*6)+(4*5)+(3*7)+(2*5)+(1*3)=119
119 % 10 = 9
So 131657-53-9 is a valid CAS Registry Number.
131657-53-9Relevant articles and documents
Reactions and Diastereoselectivity of N2-Arylsulfonyl Amidine Anions
Magnus, Philip,Moursounidis, John
, p. 1529 - 1534 (2007/10/02)
Cyclic N1-alkyl-N2-sulfonyl amidine anions undergo stereoselective aldol reactions to give the syn diastereoisomer as the major product.The ratio of syn to anti aldol products decreases as the size of the N1-alkyl increase
