157717-67-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 157717-67-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,7,1 and 7 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 157717-67:
(8*1)+(7*5)+(6*7)+(5*7)+(4*1)+(3*7)+(2*6)+(1*7)=164
164 % 10 = 4
So 157717-67-4 is a valid CAS Registry Number.
157717-67-4Relevant academic research and scientific papers
Synthesis of C-17 Trans β-lactams of the androstane series
Siddiqui,Satyanarayana,Srinivas,Siddiqui
, p. 249 - 250 (2007/10/02)
3,3'-Ethylenedioxyandrost-4-cn-17β-ol 1 was converted into the ethyl ester 2 by reaction with potassium metal and ethyl chloroacetate. The ethyl ester 2 on reaction with hydrazine gave the hydrazide 3. Condensation of 3 with aryl aldehydes gave the Schiff
