221911-41-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221911-41-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,9,1 and 1 respectively; the second part has 2 digits, 4 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221911-41:
(8*2)+(7*2)+(6*1)+(5*9)+(4*1)+(3*1)+(2*4)+(1*1)=97
97 % 10 = 7
So 221911-41-7 is a valid CAS Registry Number.
221911-41-7Relevant academic research and scientific papers
Synthesis of fully-substituted enediynes by the corey-winter reaction
Crich,Pavlovic,Wink
, p. 359 - 377 (2007/10/03)
Functionalized alkynes are oxidized to the corresponding α-diketones with catalytic RuO4 and NaIO4. Treatment of these diones with metal acetylenides then gives mixtures of erythro- and threo-1,5-hexadiyne-3,4- diols with good erythr
