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189452-99-1

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189452-99-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 189452-99-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,4,5 and 2 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 189452-99:
(8*1)+(7*8)+(6*9)+(5*4)+(4*5)+(3*2)+(2*9)+(1*9)=191
191 % 10 = 1
So 189452-99-1 is a valid CAS Registry Number.

189452-99-1Downstream Products

189452-99-1Relevant articles and documents

Versatile novel syntheses of imidazoles

Rolfs, Andreas,Liebscher, Juergen

, p. 3480 - 3487 (2007/10/03)

A novel ring transformation/desulfurization of substituted 2-methyl-1,2,4-thiadiazolium salts 2 provides a versatile entry to imidazoles 3 with a variety of substituents. Simple one-pot procedures combine the preparation of starting 1,2,4-thiadiazolium salts 2 from N-(thiocarbonyl)-N'-methylamidines 1 or 1,2,4-dithiazolium triiodides 6 with the ring transformation/desulfurization to the imidazoles 3. Alternatively, N-(thiocarbonyl)-N'-methylamidines 1 can be transformed to imidazoles 3 or to 1-substituted imidazoles 5 via S-methylation and elimination of methylthiol. In the same manner, a new entry to 4H-imidazoles 8 could be developed.

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