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81731-54-6

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81731-54-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81731-54-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,7,3 and 1 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 81731-54:
(7*8)+(6*1)+(5*7)+(4*3)+(3*1)+(2*5)+(1*4)=126
126 % 10 = 6
So 81731-54-6 is a valid CAS Registry Number.

81731-54-6Relevant articles and documents

Carbon-Carbon Bond Formation by the Use of Chloroiodomethane as a C1 Unit. III. A Convenient Synthesis of the Mannich Base from Enol Silyl Ether by a Combination of Chloroiodomethane and N,N,N',N'-Tetramethylmethanediamine

Miyano, Sotaro,Hokari, Hiroshi,Hashimoto, Harukichi

, p. 534 - 539 (2007/10/02)

The Mannich dimethylaminomethylation of carbonyl compounds is conveniently carried out via enol trimethylsilyl ethers by a combination of chloroiodomethane (CH2ClI) and N,N,N',N'-tetramethylmethanediamine (TMMD) in DMSO as the solvent at ambient temperatute.The mechanism of the transformation is discussed on the basis of product analysis and 1H NMR spectral studies.The reagent system CH2ClI/TMMD also provides a convenient route to the Eschenmoser's salt ().

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