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220042-68-2

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220042-68-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 220042-68-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,0,0,4 and 2 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 220042-68:
(8*2)+(7*2)+(6*0)+(5*0)+(4*4)+(3*2)+(2*6)+(1*8)=72
72 % 10 = 2
So 220042-68-2 is a valid CAS Registry Number.

220042-68-2Relevant articles and documents

Synthesis of 7-hydroxy-2-(2-hydroxybenzoyl)benzo[c]chromen-6-ones by sequential application of domino reactions of 1,3-bis(silyl enol ethers) with benzopyrylium triflates

Lubbe, Mathias,Appel, Bettina,Flemming, Anke,Fischer, Christine,Langer, Peter

, p. 11755 - 11759 (2006)

The domino, Michael-retro-Michael-aldol, reaction of 2,4-bis(trimethylsilyloxy)penta-1,3-diene with 3-formylchromones afforded 4-(2-hydroxybenzoyl)-2-acetylphenols, which were transformed into 6-(2-hydroxybenzoyl)chromones. The Me3SiOTf-mediate

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