21161-19-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21161-19-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,6 and 1 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 21161-19:
(7*2)+(6*1)+(5*1)+(4*6)+(3*1)+(2*1)+(1*9)=63
63 % 10 = 3
So 21161-19-3 is a valid CAS Registry Number.
21161-19-3Relevant articles and documents
β-Lactam Formation by Ultrasound-promoted Reformatsky Type Reaction
Bose, Ajay K.,Gupta, Kavita,Manhas, M. S.
, p. 86 - 87 (2007/10/02)
Ultrasound was found to promote the reaction between ethyl bromoacetate, zinc, and a Schiff base such that an excellent yield of β-lactams was obtained in a few hours at room temperature.