127557-20-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 127557-20-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,7,5,5 and 7 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 127557-20:
(8*1)+(7*2)+(6*7)+(5*5)+(4*5)+(3*7)+(2*2)+(1*0)=134
134 % 10 = 4
So 127557-20-4 is a valid CAS Registry Number.
127557-20-4Relevant articles and documents
The Preparation of 3,4-Dihydro-1-benzoxepin-5(2H)-ones
Freedman, Jules,Stewart, Kenneth T.
, p. 1547 - 1554 (2007/10/02)
Several methods for the preparation of 3,4-dihydro-1-benzoxepin-5(2H)-ones are described.In addition to the desired ketones, a veriety of novel by-products have been isolated.
