221538-22-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221538-22-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,5,3 and 8 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 221538-22:
(8*2)+(7*2)+(6*1)+(5*5)+(4*3)+(3*8)+(2*2)+(1*2)=103
103 % 10 = 3
So 221538-22-3 is a valid CAS Registry Number.
221538-22-3Relevant academic research and scientific papers
Synthesis of indole-2-carboxylic acid esters
Allen, Darin A.
, p. 447 - 455 (2007/10/03)
The title compounds were prepared via lateral lithiation of N-Boc protected toluidines with sec-BuLi, quench with diethyl oxalate, followed by dehydration in TFA/CH2Cl2.
