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204444-55-3

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204444-55-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 204444-55-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,4,4 and 4 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 204444-55:
(8*2)+(7*0)+(6*4)+(5*4)+(4*4)+(3*4)+(2*5)+(1*5)=103
103 % 10 = 3
So 204444-55-3 is a valid CAS Registry Number.

204444-55-3Relevant articles and documents

Tetrabutyl ammonium bromide as a catalyst for reaction of 5(4)-bromo-2-methyl-4(5)-nitroimidazole with phenacyl bromides

Sobiak, Stanislaw

, p. 155 - 158 (2007/10/03)

Reactions of 5(4)-bromo-2-methyl-4(5)-nitroimidazole with phenacyl bromide, tetrabutylammonium bromide (TBAB) and sodium bicarbonate in the sonication condition resulted in a mixture of 4-bromo-5-nitroimidazoles [IIIa-e] and 5-bromo-4-nitroimidazoles [IVa-e] at an excellent yield of over 85% and, surprisingly, at the isomers ratio of 2:1.

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