90821-68-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 90821-68-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,8,2 and 1 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 90821-68:
(7*9)+(6*0)+(5*8)+(4*2)+(3*1)+(2*6)+(1*8)=134
134 % 10 = 4
So 90821-68-4 is a valid CAS Registry Number.
90821-68-4Relevant academic research and scientific papers
A new strategy for the conversion of penams into cephems via allene chemistry
Farina, Vittorio,Kant, Joydeep
, p. 3559 - 3562 (2007/10/02)
We describe an extension of the Morin rearrangement in which 3-norcephalosporins bearing sulfur substituents at C(3) are obtained directly from an allenic intermediate, which is efficiently prepared from penicillin V sulfoxide.
