98203-54-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 98203-54-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,8,2,0 and 3 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 98203-54:
(7*9)+(6*8)+(5*2)+(4*0)+(3*3)+(2*5)+(1*4)=144
144 % 10 = 4
So 98203-54-4 is a valid CAS Registry Number.
98203-54-4Relevant academic research and scientific papers
CHIRAL QUATERNARY CARBON COMPOUNDS. II. AN ASYMMETRIC SYNTHESIS OF (R) OR (S)-4,4-DIALKYL-2-CYCLOPENTENONES.
Meyers, A. I.,Wanner, Klaus Th.
, p. 2047 - 2050 (2007/10/02)
The chiral bicyclic lactam (5) derived from levulinic acid and (S)-valinol is sequentially alkylated and then cleaved to 2,2-dialkyl levulinaldehyde (8) which is cyclized to the title products (9) in > 99percent ee.
