256390-67-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 256390-67-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,6,3,9 and 0 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 256390-67:
(8*2)+(7*5)+(6*6)+(5*3)+(4*9)+(3*0)+(2*6)+(1*7)=157
157 % 10 = 7
So 256390-67-7 is a valid CAS Registry Number.
256390-67-7Relevant articles and documents
Convenient synthesis of L-proline benzyl ester
Cordova, Armando,Reed, Neal N.,Ashley, Jon A.,Janda, Kim D.
, p. 3119 - 3122 (2007/10/03)
Mesylates or tosylates of δ-hydroxy-L-norvaline esters spontaneously afford L-proline esters upon exposure to aqueous buffer in near quantitative yield. This novel reaction has led to the development of a simple route to optically active proline esters.