The CAS Registry Mumber 134220-56-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,4,2,2 and 0 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 134220-56: (8*1)+(7*3)+(6*4)+(5*2)+(4*2)+(3*0)+(2*5)+(1*6)=87 87 % 10 = 7 So 134220-56-7 is a valid CAS Registry Number.
Reaction of aromatic N-oxides with dipolarophiles. XV. Formation of the 1,5-sigmatropy products and their double ene reaction products
Matsuoka,Ono,Harano,Hisano
, p. 10 - 17 (2007/10/02)
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