74740-85-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 74740-85-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,7,4 and 0 respectively; the second part has 2 digits, 8 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 74740-85:
(7*7)+(6*4)+(5*7)+(4*4)+(3*0)+(2*8)+(1*5)=145
145 % 10 = 5
So 74740-85-5 is a valid CAS Registry Number.
74740-85-5Relevant academic research and scientific papers
The Chemistry of 4-Mercaptoazetidine-2-ones. Part 2. Synthesis of Bisnorpenicillins
Osborne, Neal F.
, p. 150 - 155 (2007/10/02)
Reaction of the 4-mercaptoazetidinone (2) with benzyl 2-bromoacrylate gave the C-3-epimeric bisnorpenicillin esters (6b) and (7b).Standard procedures were used to convert the ester (6b) into bisnorpenicillin V (3) and bisnorampicillin (15).By contrast (2)
