420840-13-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 420840-13-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,2,0,8,4 and 0 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 420840-13:
(8*4)+(7*2)+(6*0)+(5*8)+(4*4)+(3*0)+(2*1)+(1*3)=107
107 % 10 = 7
So 420840-13-7 is a valid CAS Registry Number.
420840-13-7Relevant articles and documents
Short asymmetric synthesis of (2S,3S)- and (2S,3R)-3-prolinoglutamic acids: 2-carboxy-3-pyrrolidine-acetic acids (CPAA)
Karoyan, Philippe,Chassaing, Gérard
, p. 253 - 255 (2002)
The asymmetric synthesis of both cis and trans 3-prolinoglutamic acids can be easily achieved in a diastereoselective and enantioselective way via the amino-zinc-enolate cyclisation.
