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221235-24-1

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221235-24-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 221235-24-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,2,3 and 5 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 221235-24:
(8*2)+(7*2)+(6*1)+(5*2)+(4*3)+(3*5)+(2*2)+(1*4)=81
81 % 10 = 1
So 221235-24-1 is a valid CAS Registry Number.

221235-24-1Relevant articles and documents

Novel C-Alkylation Reaction of Condensed Thiophenes with Enaminones, Enaminonitriles, Ethoxymethylenemalonitrile, Aryl Vinyl Ketones and ω-Nitrostyrenes

Al-Etabi, Alya,Al-Awadi, Nouria,Al-Omran, Fatima,Abdel-Khalik, Mervat Mohammed,Elnagdi, Mohamed Hilmy

, p. 151 - 163 (2007/10/03)

The reaction of 1 with enaminones (3a-c) affords either the enaminones 4a-c or a mixture of 4a-c and the α,β-unsaturated ketones 9a-c depending on applied reaction conditions. Compounds 4a-c rearranged into 9a-c on long reflux in dioxane solution in prese

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