157397-94-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 157397-94-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,3,9 and 7 respectively; the second part has 2 digits, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 157397-94:
(8*1)+(7*5)+(6*7)+(5*3)+(4*9)+(3*7)+(2*9)+(1*4)=179
179 % 10 = 9
So 157397-94-9 is a valid CAS Registry Number.
157397-94-9Relevant articles and documents
Stereochemistry of radical cyclizations to side-chain olefinic bonds. An approach to control of the C-9 center of morphine
Parker,Fokas
, p. 3927 - 3932 (2007/10/02)
Styrenes of general structure 5 undergo tandem radical cyclization to cis,cis-hydrophenanthrofurans 9, products which contain the carbocyclic skeleton of the morphine alkaloids. Vinylurethane 5E-NHCO2Et cyclizes to 9α via the intermediate radic