643755-75-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 643755-75-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,3,7,5 and 5 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 643755-75:
(8*6)+(7*4)+(6*3)+(5*7)+(4*5)+(3*5)+(2*7)+(1*5)=183
183 % 10 = 3
So 643755-75-3 is a valid CAS Registry Number.
643755-75-3Relevant articles and documents
Asymmetric Synthesis of 4,5-Disubstituted 3-Hydroxy δ-Lactones: Prelactone B and Prelactone V
Enders, Dieter,Haas, Mareile
, p. 2182 - 2184 (2003)
An efficient asymmetric synthesis of δ-lactones such as prelactone B has been developed. As key steps, the SAMP/RAMP-hydrazone methodology for the synthesis of 2-methylenated 1,3-diols and a homogenous hydrogenation were used.