111981-42-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 111981-42-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,9,8 and 1 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 111981-42:
(8*1)+(7*1)+(6*1)+(5*9)+(4*8)+(3*1)+(2*4)+(1*2)=111
111 % 10 = 1
So 111981-42-1 is a valid CAS Registry Number.
111981-42-1Relevant academic research and scientific papers
SYNTHESIS OF A NOVEL CARBAPENEM-POTASSIUM (5R,6R)-1,1-DIFLUORO-2-PHENYL-6-(1R-HYDROXYETHYL)-CARBAPEN-2-EM-3-CARBOXYLATE. THE USE OF A NEW N-PROTECTING GROUP IN &β-LACTAM SYNTHESIS
Shah, Nalini V.,Cama, Lovji D.
, p. 221 - 227 (2007/10/02)
A synthesis of a novel 1,1-difluorocarbapenem (1), utilizing a new N-protecting group for the position of 2-azetidinones is described.
